Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d82b4b9c19aad2d…

MALICIOUS

PDF

78.8 KB Created: 2021-05-20 03:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6508eaf4945daf3aead95fb199f0470a SHA-1: e2b62a64f170a4f04a0136dd9feb288491d0153d SHA-256: 0d82b4b9c19aad2d2a11d2ae79079ae44ab7aca3b7f1c70297162417fe84da84
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to potentially malicious or spammy content, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary URL, https://botokaw.ru/strik, is likely a phishing or malware distribution point. While no scripts were explicitly extracted, the PDF structure and the high number of external links suggest an attempt to redirect users to malicious websites, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=hc+verma+physics+class+11+pdf+book
    • https://zafojulokigod.weebly.com/uploads/1/3/4/7/134741370/vegowuf.pdf
    • https://cdn-cms.f-static.net/uploads/4445130/normal_603d3c6f74edc.pdf
    • https://static.s123-cdn-static.com/uploads/4424632/normal_6003893bc8f57.pdf
    • https://cdn-cms.f-static.net/uploads/4421335/normal_6039140652cbb.pdf
    • https://static.s123-cdn-static.com/uploads/4488116/normal_6004cb988b97f.pdf
    • https://static.s123-cdn-static.com/uploads/4380691/normal_6003e15ad4ea0.pdf
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/3292710.pdf
    • https://static.s123-cdn-static.com/uploads/4370088/normal_5fcea740eb248.pdf
    • https://gekokalomekifa.weebly.com/uploads/1/3/4/5/134597992/vawavexijojejexexo.pdf
    • https://cdn-cms.f-static.net/uploads/4413978/normal_60295eec26d75.pdf
    • https://jozisilefetaj.weebly.com/uploads/1/3/4/4/134476246/pikevipomelewivatop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gotenukevepunin/how_to_wire_a_motion_sensor_light_red_wire.pdf
    • https://uploads.strikinglycdn.com/files/6c77c4da-c88d-4a80-ba39-05da74f07b7d/ejercicios_gramatica_ingles_b1_con_soluciones.pdf
    • https://s3.amazonaws.com/jafujasiwetid/mabopoduzijidelomorif.pdf
    • https://s3.amazonaws.com/bupesejirijejus/prime_factorization_worksheets.pdf
    • https://s3.amazonaws.com/wozowuledij/venapubinafavukenu.pdf
    • https://uploads.strikinglycdn.com/files/7e4b6979-dad2-4cd9-9b46-3612cce29532/how_to_pair_a_vizio_subwoofer.pdf
    • https://s3.amazonaws.com/bewibiwat/dance_school_timetable_template_free.pdf
    • https://uploads.strikinglycdn.com/files/04166d1a-06e4-4271-978e-77afe1ab8dec/30058470495.pdf
    • https://s3.amazonaws.com/pegozegi/53059152283.pdf
    • https://s3.amazonaws.com/ruzaganog/old_betking_app.pdf
    • https://uploads.strikinglycdn.com/files/8791295b-0bd4-4008-b9c4-267fd5310da4/bible_quiz_genesis_1-50_with_answers_in_telugu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e80b.bin
6051c987e47d43d1f2a8961624dec899034166423fb6c6da4974ae62b7cf9b42
pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 5376 bytes
font_01_sfnt_off0000fa49.bin
58e0920684968edcef77d3ad229641bbffcb711ccfa9cbe3171e018b53238901
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 10996 bytes
font_02_sfnt_off00011fad.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 4324 bytes