Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c29d0c52e4fcbf…

MALICIOUS

PDF

97.8 KB Created: 2021-03-18 11:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0b2363ce9faae9945c3b33813d9c3bb1 SHA-1: 37a071c8f984a36bce9a6ed7cf4162a3938b541b SHA-256: 36c29d0c52e4fcbf497352d5745740f1f283612fb9a6df2c9404a379249b0fc8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jottigo.ru/award?keyword=section+3.+1+the+rock+cycle+answer+key+pdf PDF link annotation
    • https://ximizewilaxeju.weebly.com/uploads/1/3/1/3/131381769/ce5028eead.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/uhjggSW/zavisakofez.pdfIn PDF document text
    • https://cdn.sqhk.co/gudupixure/dUjggjh/49239134485.pdfIn PDF document text
    • https://rezigetofetima.weebly.com/uploads/1/3/1/1/131163738/253724.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/BgehhhW/35505472678.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/pusedez.pdfIn PDF document text
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/kifulojupebifax.pdfIn PDF document text
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/susarezibizegew.pdfIn PDF document text
    • https://tobisimotar.weebly.com/uploads/1/3/5/3/135330661/48e681a8.pdfIn PDF document text
    • https://karozazosepi.weebly.com/uploads/1/3/4/3/134316788/4ea11.pdfIn PDF document text
    • http://familyit.info/xabaxefotajn6rk2.pdfIn PDF document text
    • http://vittorguxx.site/aws_cli_ecr_image91xeh.pdfIn PDF document text
    • https://vikisoxez.weebly.com/uploads/1/3/4/7/134712259/7022805.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/setaxilitozuko/is_how_the_grinch_stole_christmas_on_netflix.pdfIn PDF document text
    • http://femiworuw.rf.gd/how_to_update_verizon_lg_flip_phone_to_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/98425561089.pdfIn PDF document text
    • http://sazizonega.rf.gd/82737333269.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_off00013d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D10 5852 bytes
SHA-256: d8b1d29681b8a67a7fa3dcd9fd7927bb1b8a022f149793b6394f6b1408d5e572
font_01_sfnt_off00015123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15123 11868 bytes
SHA-256: f28eb60e73f3d9a71eb32931644b65d8b89f6b37912deb77026cff0b3c19deb1

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