Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f441d2d4bb3cbf…

MALICIOUS

PDF

102.3 KB Created: 2021-02-14 17:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 92cb6c7560b92502f3495d6b337b596a SHA-1: d202aaaa43d58a8f5ca87cfcb105d322c815c746 SHA-256: c1f441d2d4bb3cbf7448486d7931f65e24c39f1a749777c0d99cae6941b18f11
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure and embedded links suggest it's part of a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://yafferge.ru/123?utm_term=hayward+pro+series+sand+filter+s180t+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4404512/normal_5fdfb86187649.pdfIn PDF document text
    • http://luferuvijudadof.22web.org/scrabble_letters_printable.pdfIn PDF document text
    • https://nuxajitavira.weebly.com/uploads/1/3/1/8/131871558/towiwaxinejijotosogi.pdfIn PDF document text
    • http://lefegesitorezod.iblogger.org/top_grammar_checker_app_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462351/normal_5feafab49547a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449616/normal_5fd9d09817c2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483075/normal_5fd67d34270bb.pdfIn PDF document text
    • https://rogewakaz.weebly.com/uploads/1/3/2/8/132815912/zavaborofinuw-fujedimopawa.pdfIn PDF document text
    • http://kikavixerag.iblogger.org/nuzabuxigazalipitefifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_600a5baff1aa2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445871/normal_5fe3b2f468222.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://xuvaduw.epizy.com/voporaxegepofixakunulu.pdfIn PDF document text
    • http://katezoluvezile.epizy.com/degrees_of_comparison_worksheets_for_grade_5.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
    • http://scripts.sil.org/OFLIn 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

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12886 1692 bytes
SHA-256: 2030d2d1d7edbf6de57b867059dcd6b8a7930342c356850acabb412adda4644f
font_01_sfnt_off000130e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E1 5728 bytes
SHA-256: 430a4b0ea94a3034e499a06538c191c573b6d6c8191fe3aa3bb8fa9efd240ce8
font_02_sfnt_off0001446c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446C 13216 bytes
SHA-256: 6834983cf950ec4e6dff06b50ca7601d902a068a606a939012b4ba6dd2eb83fe
font_03_sfnt_off000171b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171B1 2428 bytes
SHA-256: 1a20996e327f966729c1acf9b93ae8bf9abfc682f092e21f3e0a5d6756ded962
font_04_sfnt_off00017b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B83 6108 bytes
SHA-256: 8bf64fc0e2e91d8ff14305a8c2023324d2bfcdd94101166d043896d2b51c6af7

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