Malicious PDF — malware analysis report

Static analysis result for SHA-256 75491146a0ce35bb…

MALICIOUS

PDF

69.3 KB Created: 2021-01-19 17:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98486ca6b20cc035e6776b2113049343 SHA-1: ba00cda7ee07f0084c4f575bb085a092bb439c88 SHA-256: 75491146a0ce35bbfa2a54ef39958ba97aa03b0f76ebeb56e2e6d92e4af2f162
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicating a link farm for SEO or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, particularly the one leading to a PDF on s3.amazonaws.com, are likely part of a chain to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/aws?utm_term=kahoot+theme+song+sheet+music
    • https://static.s123-cdn-static.com/uploads/4408720/normal_60034f1373458.pdf
    • https://wudatoguji.weebly.com/uploads/1/3/4/8/134885495/zamenofupevob.pdf
    • https://cdn-cms.f-static.net/uploads/4418383/normal_5f9e71a909cba.pdf
    • https://static.s123-cdn-static.com/uploads/4370055/normal_5fe0ad903e84f.pdf
    • https://site-1180799.mozfiles.com/files/1180799/23676795029.pdf
    • https://site-1196275.mozfiles.com/files/1196275/tavenuwuvatefiwi.pdf
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/6306473.pdf
    • https://site-1178374.mozfiles.com/files/1178374/bewadulupetamile.pdf
    • https://static.s123-cdn-static.com/uploads/4474445/normal_5ff9c9732c87c.pdf
    • https://fuxexitir.weebly.com/uploads/1/3/4/0/134098624/kotuwifowibip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bivanud/jikinitodemonewoleker.pdf
    • http://kagokonutuvep.epizy.com/46714552526.pdf
    • https://s3.amazonaws.com/bewibiwat/pusegovawomewodubar.pdf
    • https://s3.amazonaws.com/bitizopovopaso/spotify_premium_apk_latest_mod.pdf
    • https://s3.amazonaws.com/xakajoziwibi/newest_snapchat_update_apk_download.pdf
    • https://s3.amazonaws.com/zuwimadaneb/5_string_bass_guitar_notes_chart_printable.pdf
    • https://s3.amazonaws.com/tetazino/vowabefuximonunizebuxeje.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d23f.bin
0442afa64ddced008c57821c17dd0f33df0f062c65d9c0b8423b813bbb67f1b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD23F 5056 bytes
font_01_sfnt_off0000e356.bin
dc2e997d1ee2fbed31524667a6c0db29c68dcdd861a93b26d644e07bcb8af6bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 10812 bytes