Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55adda26b1c9ef6…

MALICIOUS

PDF

74.6 KB Created: 2021-04-30 23:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f12a188772d7f4851793e6de091b0a72 SHA-1: 508afa88996a66a992984f0dd044424b6f711699 SHA-256: f55adda26b1c9ef6337678fce39ad3abdbc570cc93e8de3c8bd714f2f4228eed
134 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. It uses an urgency-based lure. 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://baarspo.ru/strik?utm_term=greatest+discoveries+with+bill+nye+genetics+video PDF link annotation
    • http://sdfafq.info/lugekoponadarinakavaf0sflj.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/jJggqgc/99404067499.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/fYthCgc/zibega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_601dc688b37eb.pdfIn PDF document text
    • https://cdn.sqhk.co/visipapafef/ejd5gcL/72545999605.pdfIn PDF document text
    • http://nature-ital.space/xanejelesikd3rli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474977/normal_602498bd29360.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/math_symbols_and_meanings.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxeromewime/deXV6bm/enemy_strike_hack_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/T3helgi/strikers_1945_classic_arcade.pdfIn PDF document text
    • http://tameenegypt.com/corporate_minute_book_template_alberta1ah3p.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/la_la_land_piano_song_ryan_gosling.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/jgjhdhf/easy_dessert_recipes_with_chocolate_cake_mix.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/vovopafubipu/wakakogalotanudewadadi.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/apple_watch_4_new_faces.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/50037710166.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_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 5628 bytes
SHA-256: fefbd6fa5bbb4a33d6fb650bc87843eff3b4fc102c303fbc0c29dbe9f88e125c
font_01_sfnt_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 11288 bytes
SHA-256: db22eb4a5c831230155bb814e1510661aab1b3f9c740402d2901b1a8cefcbf5e

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