Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea43f928dfcca9d…

MALICIOUS

PDF

122.6 KB Created: 2021-02-11 06:15:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 73fd5a148d003c145d023d5da8d92831 SHA-1: df316f28496b3082d2d5bc53a631a7943cb59e5c SHA-256: aea43f928dfcca9d15a63211917bcf9c48ebaa7f4ba77599b1ed6ff0b8fee471
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to external PDF files, indicating a link farm or SEO manipulation tactic. Several heuristics confirm the malicious nature, including a critical finding of a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious classification. No scripts were extracted, but the primary attack pattern involves directing users to potentially malicious or SEO-abused content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/wb?keyword=arabic%20characters%20forms In PDF document text
    • https://cdn.sqhk.co/gafisasiwu/eTKwHgc/26631281932.pdfIn PDF document text
    • https://bimufoju.weebly.com/uploads/1/3/4/3/134311804/e8887a49fabf020.pdfIn PDF document text
    • https://debamivuk.weebly.com/uploads/1/3/1/8/131871977/4709002.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/3e650f3fa8.pdfIn PDF document text
    • https://gotedajasokidu.weebly.com/uploads/1/3/1/4/131407980/lutadinevu.pdfIn PDF document text
    • https://niromegezos.weebly.com/uploads/1/3/2/6/132681660/lejabeze.pdfIn PDF document text
    • https://pafegesufo.weebly.com/uploads/1/3/4/7/134719460/9198331.pdfIn PDF document text
    • https://kowasazupajobex.weebly.com/uploads/1/3/1/3/131383373/pajagezobuxuvo.pdfIn PDF document text
    • https://gugeropufil.weebly.com/uploads/1/3/0/8/130874104/52728e.pdfIn PDF document text
    • https://pejasosujotu.weebly.com/uploads/1/3/2/6/132683127/padolomuguj.pdfIn PDF document text
    • https://cdn.sqhk.co/wabasenenem/jidjgZR/67730559753.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nifukugobu.rf.gd/45796938468.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/headstart_beginner_student_s_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/sembaruthi_sembaruthi_song.pdfIn PDF document text
    • http://redotikami.rf.gd/80398015592.pdfIn PDF document text
    • http://jubadoloje.epizy.com/aat_level_2_bookkeeping_controls.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/32934096319.pdfIn PDF document text
    • http://pigosoj.epizy.com/chemistry_laboratory_glassware_word_search_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/conceptual_framework_for_financial_reporting_summary.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000116c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x116C1 12588 bytes
SHA-256: b9d6d1d83fe2a0ce071c89619e83bd5dac0b779ff7e257c578f8e539373faed0
stream_008_off0001968b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1968B 43976 bytes
SHA-256: 9ee04ac32701259cd450b7e395bb7459a2d4c82ccaa64da126a7dee484b50bea
font_01_sfnt_off00013506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13506 1636 bytes
SHA-256: a9ad9ad0a96fe26ac6797df49b1e626b392e9366165fda36ca18888fb22e3261
font_02_sfnt_off00013d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D13 2888 bytes
SHA-256: 604725ebf9bf0d9ab2bcf42cb3b9eb1946ba017bf99d5c2e6531ff47cfbc4b7a
font_03_sfnt_off00014756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14756 5220 bytes
SHA-256: 51a3a03798e5bb915252fce4f045481a6bbc0254cdd408e6dd0b4ec54b145440
font_04_sfnt_off000158ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158AC 9940 bytes
SHA-256: d0ee7d097c07d1154850aa9c283bf22ca48fa0fb54ef5b0bbaad2a90f340fff4
font_05_sfnt_off00016e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E8A 12608 bytes
SHA-256: cf0a529e6560c03dc9ff31f6cd0a3e37acd33e2ec10ef6eccebc9a0c60c4b7bd

Open this report in the interactive analyzer, or submit your own file for analysis.