Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbfc7fb66a2f7cd…

MALICIOUS

PDF

70.2 KB Created: 2021-03-19 18:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 9ef08f2495e5cf1cc76630a4d1658ea6 SHA-1: 0189abda18841ba3ab9173fd76eb5b5a0dc7a580 SHA-256: bdbfc7fb66a2f7cd1edaa0a693806057b01fe6d400382c62267705eb66d506da
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs and the heuristic firings strongly suggest the document's purpose is to redirect users to potentially harmful websites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=actiontec+mi424wr+rev+f PDF link annotation
    • https://cdn.sqhk.co/ledodatefu/ihbRhhN/mefoguzuvegozogutemomip.pdfIn PDF document text
    • http://demask.space/66_books_of_the_bible_tagalog_listxxf9k.pdfIn PDF document text
    • http://vash-fasad.live/grey_s_anatomy_episode_guide_airb5ovd.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/igI1ijd/xavusanokutixavixuv.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/gjQhiid/lifum.pdfIn PDF document text
    • http://leree4.club/43312099409rayxn.pdfIn PDF document text
    • http://jumbochecker.com/partition_que_vive_mon_me__te_loueroalpi.pdfIn PDF document text
    • https://cdn.sqhk.co/tidilotofuka/bKhhheU/27027296614.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_b2c3f5a7bbf740449dcf9b49c756f8a6.pdf?index=trueIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_ca1120c99cdd44caa81caa4900d55907.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/how_much_do_journeyman_welders_make_in_california.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/cooks_essentials_pressure_cooker_model_cepc600s_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b9e1198-653d-421c-8874-30c349c6aecd/2035474101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/879f3aac-ab58-41b2-9642-5d6480a14ba1/jubasisakilovijumodiker.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/wabasedamukanufulupirad.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_off0000d4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C5 4968 bytes
SHA-256: 78219029eaf5ef8e5b794bd8ee88662ea7f44419e0517832ac0a1982cf5440f5
font_01_sfnt_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 11676 bytes
SHA-256: 022840560f569e88a9d07d736a3fa235946ede41e91cf4eca2829e117e56ebc2

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