Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c3733256eb6051…

MALICIOUS

PDF

75.8 KB Created: 2021-01-03 14:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bbd0cdc7885276174a45650de604b117 SHA-1: 7a4a5ee1f79e7e9ea98caad1b026768438dfcc3e SHA-256: 79c3733256eb60517562570f03b4d2ee46f383bd2c69d57aed55c7f130f55fe1
222 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which points to a known malicious redirector. The document's content, though heavily obfuscated, suggests a lure related to software installation, aligning with phishing tactics. The presence of multiple external PDF links and a critical heuristic firing for malicious redirector links indicates a high likelihood of this document being used to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffine.ru/aws?utm_term=microsoft+dynamics+365+on+premise+installation+guide In PDF document text
    • https://rasuzumiketasak.weebly.com/uploads/1/3/4/3/134393825/3323701.pdfIn PDF document text
    • https://cdn.sqhk.co/gefisodir/gGgg7jP/78302168792.pdfIn PDF document text
    • https://wofudanizosaxig.weebly.com/uploads/1/3/1/6/131637209/xagakirasajurasi.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/vebisop/budaya_populer_jepang.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31ccbdd-6b0e-4341-8376-ad39619ec6b9/29448242537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/776ef8a5-d495-4575-a38a-577ce07ea48d/71896904828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d235e4d5-55ef-4575-a76f-508f5b8e75ff/moe_girl_cafe_2_tips_and_tricks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49196420-b02f-4f6f-810a-6b1e83065ac8/sakid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e09ed24-11d9-4acb-8e71-ccff7cdb2104/44465352591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a47c46-1e1c-457a-b46c-89733f009ed3/65150818703.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/optimizely_logo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 6024 bytes
SHA-256: 4fec4e3dc2cc2a0e1d9b0efabf9d9ea17604fc28ad28c608330ff2e1270c07e7
font_01_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 11016 bytes
SHA-256: 3ef87dcefa73102530d0a945a0599b10ac7ed0ce5cfbd9aa2c516ed6d65c7ae1

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