Malicious PDF — malware analysis report

Static analysis result for SHA-256 108cdc80e277a556…

MALICIOUS

PDF

75.8 KB Created: 2021-04-03 09:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 400db820c0183426da4fe34232372fa3 SHA-1: 998e137e8e7124ac71b754e2eff9584a9a0e24a1 SHA-256: 108cdc80e277a55698adeda9da9b3693ccd647e5836d33f1e5ac5777accdd0c0
134 Risk Score

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://resalured.ru/strik?utm_term=how+to+use+relion+blood+sugar+monitor PDF link annotation
    • http://daimontimur.org/chemistry_practical_book_for_bsc_1st_yearjp3f0.pdfIn PDF document text
    • http://voztrans.ru/jexafatutbo5rr.pdfIn PDF document text
    • http://petersikdar.com/the_invisible_man_hg_wells_quotestp031.pdfIn PDF document text
    • http://firstsecu-paypal.com/75968082346rnu77.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/puibbja/nostalgia_meaning_in_bengali.pdfIn PDF document text
    • http://7evenrp.ru/mapibartlptj.pdfIn PDF document text
    • https://cdn.sqhk.co/laloropaki/LUjegfO/zombi_granny_scary_adventure_horror_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiren/cigooje/hammer_nail_titanium_bowling_ball.pdfIn PDF document text
    • http://ipai.online/voluvudosasudumibiw0wck.pdfIn PDF document text
    • http://goodsfor.life/kojuzidozofoborunalazopp6s3.pdfIn PDF document text
    • http://domavera.ru/150634834017v85d.pdfIn PDF document text
    • https://cdn.sqhk.co/nunexijezep/igigpy2/powipudafagojaki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giwibajoxuriges.rf.gd/a_swiftly_tilting_planet_read_online.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/context_clues_worksheet_1_answers.pdfIn PDF document text
    • http://fugewad.rf.gd/senedalidisisapufix.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/can_t_open_ics_file_on_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/informe_diagnostico_empresarial_ejemplo.pdfIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_fce3b99509484ad2ab958ebbb87a468f.pdf?index=trueIn PDF document text
    • https://fa3f2985-242d-4a4c-93c0-6adbfb259eaf.filesusr.com/ugd/8dbe7a_81a76bbb8b2d44ccbb81b0bb5829ed80.pdf?index=trueIn 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_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 5336 bytes
SHA-256: 6dd42a752ecc3313056269b5489ada17b6d46dba78ef7444d66029961791d176
font_01_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 10928 bytes
SHA-256: 3da300c78665eb17ce01b37189e5057a7ecaee9d3ed8b11c3749708e2e2c1a4d

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