Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cabcbc90a71a47…

MALICIOUS

PDF

72.7 KB Created: 2020-12-02 01:17:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5d48f2f467822b244490c25bf25283ab SHA-1: 96daa06bcb41371504e77ec81f241c8d00630dfe SHA-256: 77cabcbc90a71a477edfe8ee02b56a152d7cf81b4bedaef39ec202697908878f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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
  • 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.
  • 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://traffine.ru/123?utm_term=the+carnivorous+carnival+quiz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380695/normal_5f9e0f5c428d1.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/batuxilatinoxab_nekinakis.pdfIn PDF document text
    • https://tusemebi.weebly.com/uploads/1/3/4/3/134316443/3229010.pdfIn PDF document text
    • https://gawubodukajine.weebly.com/uploads/1/3/0/9/130969599/toridebi.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/b184d0b7edae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393900/normal_5fb95c943f5e6.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/2a995a4d7f07.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://static1.squarespace.com/static/5fc0f66f116eb00e3c4c456d/t/5fc34258f81c9a2a0c0b8ba2/1606632025266/improve_shoulder_press_strength.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5313f104edf1d779d1ce4/t/5fc6492ff81c9a2a0c798e88/1606830384129/maze_cut_velvet_pillow_cover.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd008c14dfd36feeb1b6e/t/5fc0da24a97599144e171b21/1606474277403/sanupukomisadimed.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e526c6229360ecacefcf/t/5fc168c51972c46e3cd3e106/1606510790010/31632544665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/757e58ce-482a-4abc-9aab-c8cecbbf9efa/kuzezuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1202595-68ea-420c-93cb-b4f816437cf9/zezagabuwajegi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a892ab79f442f234dd8a/t/5fc590425147b14804f175c5/1606783045833/84506969548.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_off0000ce96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE96 4872 bytes
SHA-256: fd66daafc4a4b521e833baa33137d2f53b73c286a1454d48c6d7ffcefbec51fb
font_01_sfnt_off0000df1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 11560 bytes
SHA-256: 1c9af5c1e8945b09e02fb079fc5fb4d3b87202086fc5785d5c962d17bf4dacfd
font_02_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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