Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c7b59e5cdd9446…

MALICIOUS

PDF

100.3 KB Created: 2021-02-17 06:20:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b1031f5911a98c94fa4ef6fc4e3ce5e8 SHA-1: 5eef63b518bea31248d618023bb971cbacd77021 SHA-256: f2c7b59e5cdd944626b0f36a93e86f1baac5563207d1cdd6018780ed7d082220
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body text appears to be obfuscated or corrupted, but the presence of numerous links suggests an attempt to direct users to external, potentially harmful, sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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/123?utm_term=why+was+cain+angry+with+abel In PDF document text
    • https://xakelagus.weebly.com/uploads/1/3/3/9/133997825/7935944.pdfIn PDF document text
    • http://barberking.best/meaning_cost_sheetbodzu.pdfIn PDF document text
    • https://retariluwefise.weebly.com/uploads/1/3/4/8/134858211/10763eaa4b56778.pdfIn PDF document text
    • http://fortuneo-enligne.com/67106617366wyop1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/38674631931.pdfIn PDF document text
    • http://wapofele.epizy.com/60417984219.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/biometric_residence_permit_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/india_visa_application_form_for_canadian_citizen.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/busugexagarurununanasap.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/atrovent_davis_drug_guide.pdfIn PDF document text
    • http://rawozenagi.epizy.com/75442322073.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015c1a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15C1A 17036 bytes
SHA-256: 18eefe7b1dead0fa668eb457318166554287f3686e93aefb023858de0fb10eee
font_00_sfnt_off0001080a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 6444 bytes
SHA-256: ad75a3fb8d1a324d763a8c82389a3e2a9dd8a8c9b196c984c145fe147615345f
font_01_sfnt_off000117fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FC 5408 bytes
SHA-256: 14cff38685604e36e37e2dde1d6961ab941238a05254ab332d4762a68dbb84a0
font_02_sfnt_off00012a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7C 15740 bytes
SHA-256: ff42674671af950ea79559cf4fa29a1dc608a3ff6b328d463c65237e22a42c19
font_04_sfnt_off00017452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17452 6200 bytes
SHA-256: 43c18fad37dad2afd040956502b8d11b79d23133a1ec614ad1a9b575726e40d7

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