Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db386232d3da7e5…

MALICIOUS

PDF

81.3 KB Created: 2021-02-19 12:20:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2b1ef6cc5e7d2736ee1d26621c21f775 SHA-1: bcdebcb0a759858477940602cf418d0859fb6d70 SHA-256: 5db386232d3da7e59f93acdcf6d74defcf095331d269e579706f234aadf3d95b
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document's content, though partially obfuscated, mentions a "bios update" lure, aligning with common social engineering tactics to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://bologen.ru/strik?utm_term=msi+970+gaming+mainboard+bios+update PDF link annotation
    • https://cdn.sqhk.co/jogekiluse/ihgegeI/zetovalobalenawin.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/igggiib/civil_war_battlefields_in_ky.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesijoja/gzuijhh/35213767684.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/jdH8qih/is_the_new_york_times_crossword_app_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/daijhfQ/empty_box_emoji_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvibabezel/Zmhjage/yellow_gameboy_pill.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/tsgdXKq/best_to_do_list_app_for_windows_7.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/apache_jmeter_3._2_for_linux.pdfIn PDF document text
    • https://cdn.sqhk.co/nonagidux/didAhfN/motorcycle_adventure_boots_brown.pdfIn PDF document text
    • http://bitasifo.22web.org/destiny_s_child_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/tifomogoketu/6jcZXje/15560277134.pdfIn PDF document text
    • https://sunitago.weebly.com/uploads/1/3/1/8/131856801/bawiguluzemuzijazi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jukiwifid.rf.gd/kupop.pdfIn PDF document text
    • http://folilef.rf.gd/48644235106.pdfIn PDF document text
    • http://putiremupupunis.epizy.com/watulokivoworepuse.pdfIn PDF document text
    • http://masidurexo.rf.gd/misivabexiwurivovefazex.pdfIn PDF document text
    • http://buzekarutazobe.rf.gd/sisatab.pdfIn PDF document text
    • http://zefabuvo.rf.gd/14670226892.pdfIn PDF document text
    • http://togipumenotu.epizy.com/autocad_2018_convert_to_cad.pdfIn PDF document text
    • http://subutolibi.rf.gd/zipot.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_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 5768 bytes
SHA-256: d4e06f93c797533ec8d59f9c02e82d33d68c519bdff8aa3ddee22893af2cd416
font_01_sfnt_off0001129d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129D 10996 bytes
SHA-256: 58baa54092eb4ae5a9355d4786d68bd6ac9af9e70148944bb1dd41ba7dbfe624

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