Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a212d3bbc4fb35c…

MALICIOUS

PDF

77.5 KB Created: 2021-03-23 14:08:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6f8e13d501e95216e74fb618b7f27834 SHA-1: cf0799a573907ca9c502846a412af30141545421 SHA-256: 2a212d3bbc4fb35c02fa6ad8d6365ce861fb9cc61c9636baa4941cac52f519fa
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links to external websites, many of which are hosted on disposable domains and are flagged as malicious redirectors. The document body, though heavily obfuscated, suggests a lure related to a 'Roomba 500 service manual pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://dafemum.ru/strik?utm_term=roomba+500+service+manual+pdf In PDF document text
    • http://lnstagram-helping-centre.com/can_you_become_a_reiki_master_online3uq8u.pdfIn PDF document text
    • http://kulinar2020.site/96645584933qz5da.pdfIn PDF document text
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/fba8cb28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418579/normal_5fffb126aac3b.pdfIn PDF document text
    • https://kowokilu.weebly.com/uploads/1/3/0/7/130740572/6c569a8acc190.pdfIn PDF document text
    • http://elinekici.online/wofiror25thr.pdfIn PDF document text
    • https://tolibalib.weebly.com/uploads/1/3/4/7/134714968/357829.pdfIn PDF document text
    • http://keepsufi.space/ld_clerk_exam_2020_date9qxmm.pdfIn PDF document text
    • http://rentline.pro/semntica_sinnimos_antnimos_homnimos_e_parnimosx195j.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/zakusoxazumizimefetowadvuhv.pdfIn PDF document text
    • http://belkwigs.com/just_drive_simulator_gameplayov83s.pdfIn PDF document text
    • https://gebifafotuzuwi.weebly.com/uploads/1/3/5/3/135324040/4539681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_602c10ad3550c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f10afe13-19c0-45ee-9bc3-c6b4a542e354/70855633223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e6ce31-1b56-44ce-8723-7c8a6f92389a/keep_on_the_shadowfell_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca223fca-08e5-4fa0-8355-defdb79b0c0d/giguwajasalozirijusit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0caf9991-70c5-474c-9655-fa959a5b0e8d/osrs_zamorak_prayer_book.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_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 5772 bytes
SHA-256: 80e40c8bcc7ebb91ac70035a102b0f8aa04ebda01a093d8f5e6cb5ea37e7b02c
font_01_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 10968 bytes
SHA-256: 832327b94b81a9bd257ef68c64893a434cab5f97a2330e2688ef3ade645f36c6

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