Malicious PDF — malware analysis report

Static analysis result for SHA-256 04625ef0336da51c…

MALICIOUS

PDF

70.6 KB Created: 2020-12-26 04:24:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a3bd3cc8de6c2ab7a65a4df3e8bb6379 SHA-1: 4e8714acb653311a295660efa6acf144748a3884 SHA-256: 04625ef0336da51c60ed78fa19e7274f5e6a0bce58c54c8a0b1a186009f92da8
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to PDF files hosted on Weebly and other platforms, suggesting a link farm designed to manipulate search engine results. One of the embedded URIs, 'https://trafficel.ru/strik?utm_term=ragdoll+bullet+physics+%25D0%25B4%25D0%25BB%25D1%258F+gta+san+andreas', appears to be a lure for game-related content, likely to trick users into visiting malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • 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://trafficel.ru/strik?utm_term=ragdoll+bullet+physics+%25D0%25B4%25D0%25BB%25D1%258F+gta+san+andreas PDF link annotation
    • https://gesebasalevajil.weebly.com/uploads/1/3/4/8/134879020/c7590.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/iivy7he/high_flow_nasal_cannula_vs_face_mask.pdfIn PDF document text
    • https://cdn.sqhk.co/xibumediw/RK97sUg/wise_live_online_teaching_and_coaching_app.pdfIn PDF document text
    • https://leresawukulet.weebly.com/uploads/1/3/1/3/131384076/b49faa95.pdfIn PDF document text
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/2493155.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/KgcjWid/bufineluzarudepinagibu.pdfIn PDF document text
    • https://xunowarusaki.weebly.com/uploads/1/3/4/3/134371630/gonuja-sumukunixazubod-valule-wikusewina.pdfIn PDF document text
    • https://jimamejovegevag.weebly.com/uploads/1/3/4/5/134593921/vobej.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/gofilafixu/science_state_test_grade_8_2019_date.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_off0000cbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEB 5856 bytes
SHA-256: 1692911255744f24c0f6095a79ad88f635ceb4ea3cda087aa669e729254f49c1
font_01_sfnt_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 13684 bytes
SHA-256: 0f1f33c661a776658ac0b7aca4b766df01a6f1e24802198e6e1b61d98b6418bd