Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc629dda33ced21f…

MALICIOUS

PDF

76.1 KB Created: 2021-06-02 03:39:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: edccf3a38993b17cdb4b093a990b2e50 SHA-1: 01ee92b0ca9857a9bb1935181e708532dbc712a4 SHA-256: bc629dda33ced21f4652e14325d10e5217affa997cf8cf0de57126daedb80f6a
194 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs, such as 'https://crewmak.ru/pbw?utm_term=1995+chevy+s10+starter+wiring+diagram', are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent, possibly to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 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.
  • 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://crewmak.ru/pbw?utm_term=1995+chevy+s10+starter+wiring+diagram PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452587/normal_60081069f09cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_606171d69fded.pdfIn PDF document text
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/jofekam.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4414153/normal_60b1d9712b49f.pdfIn PDF document text
    • https://donixefafara.weebly.com/uploads/1/3/4/3/134310569/2169757.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496402/normal_5ff996b7bf50a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413005/normal_605a5d07a3a58.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zudilazo.pbworks.com/f/cell_cycle_labeling_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4550b503-23be-4fe8-90df-daff7e6b08a0/when_a_married_man_is_interested_in_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4e835d9-4fbe-4bdf-b2c4-002645ca394e/pixemu.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/f/18741918078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a02e4b6-d588-40f8-ada0-6110de9e29c2/writing_prompts_for_high_schoolers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80542176-461a-4403-ad37-97dca78dca37/how_long_does_ultegra_di2_battery_last.pdfIn PDF document text
    • http://pafunanukexe.pbworks.com/w/file/fetch/144485295/45911113789.pdfIn PDF document text
    • http://savavaze.pbworks.com/w/file/fetch/144470760/what_are_the_most_valuable_madame_alexander_dolls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f5b71f-d868-4f5b-ade0-1f3f7005ee15/palipoledono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c242444-74bb-4c41-99cd-b2a24915606a/baluz.pdfIn PDF document text
    • http://faxamom.pbworks.com/w/file/fetch/144481029/pitix.pdfIn PDF document text
    • http://nukuxim.pbworks.com/w/file/fetch/144485490/how_to_hack_major_mayhem_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb2835c-54d7-47a6-8b5d-0a5439613675/what_is_the_difference_between_nike_air_force_1_and_07.pdfIn PDF document text
    • http://kunixove.pbworks.com/f/tableau_free_download_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab2b364d-f72d-4594-a6a4-497838089ac5/cortisone_injection_acne_singapore_price.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144426072/hadoop_the_definitive_guide_github.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_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 5956 bytes
SHA-256: 05ea0e59b61522c777faa0cf24205c7c174a507289f496fa353fac793f34183a
font_01_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 10880 bytes
SHA-256: 15207d62b6bf05c42ccdf5c0f28e358e3d434694afff21d39ff815290067d7fe

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