Malicious PDF — malware analysis report

Static analysis result for SHA-256 979cee5a05fa753f…

MALICIOUS

PDF

76.3 KB Created: 2020-11-17 21:49:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1aca3a1609fe2406ae79eedc87e72b40 SHA-1: 0bbbcbf4a07ffcd0f65f159408a0b1374585a3aa SHA-256: 979cee5a05fa753f5911afef6b54e1c825e7078b14c8850036b62f78993a2590
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/123?utm_term=ways+to+subtract+anchor+chart In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_5fad73664d65b.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/1302795.pdfIn PDF document text
    • https://nebegozanukasaz.weebly.com/uploads/1/3/4/6/134699913/nefudomoxuzuba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_5f966b49c9b2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392873/normal_5f92e0613a15f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_5f965d4807e0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407747/normal_5f9ac41e27fb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417530/normal_5fa426dc9acd5.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/sadobigiw-lizojegudaku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/294bef51-7199-48c4-9355-7bc1c48db07f/lavazza_coffee_beans_light_roast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb922a1-ccf3-4eb7-ae6b-7f1fb21041e6/97411437712.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/jwplayer_video_blob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 4828 bytes
SHA-256: b93da8446351701d4492b5de4dbe7680e7dc3b6906631ec9a823dce8c14c76c0
font_01_sfnt_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 10552 bytes
SHA-256: 2a92ff9182ee3e940b6cd0a5aeae831e8edc05127f17c43ebe3d5838b1a2e0c6
font_02_sfnt_off00011544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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