Malicious PDF — malware analysis report

Static analysis result for SHA-256 878c382a05f8688a…

MALICIOUS

PDF

173.1 KB Created: 2020-12-20 15:00:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8636cb270289c2a29379a1a636293b09 SHA-1: 5d23a45f48fb6c4e15ee2999d2337ef26bffa4b2 SHA-256: 878c382a05f8688a0e2f1fd90ec503a8ce081d6fdba79dcfff91283dd366fe62
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text fragments that suggest an informational lure, such as 'Pathfinder animate dead guide'. The presence of embedded URLs points towards a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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://cctraff.ru/strik?utm_term=pathfinder+animate+dead+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5f8d6fecdc550.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5fc9507e6af55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460980/normal_5fcdfdb9b1c59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_5fb5a5b541b82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_5fd8e1221bb2c.pdfIn PDF document text
    • https://nodararikerat.weebly.com/uploads/1/3/4/8/134885074/3a34e434.pdfIn PDF document text
    • https://ginufadep.weebly.com/uploads/1/3/4/6/134668932/c5323f4.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/9944119.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/xezosojibutikefug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6810cceb-02d7-409d-bcde-6ac017656bde/goxojunagasujunonejas.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/geektyper_app_for_android.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4dd3ec89e1c4b8fd7ff57/t/5fc556c44e98326c02c2fb44/1606768324580/fimufusibekeviw.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/zupas.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6ba80e2afa34b64a9e201/t/5fcffcd764d5ea3c991e3cd1/1607466200541/interesting_animal_did_you_know_facts_about_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e48723a-9fbd-492c-b896-6b02d8b7abbc/first_time_home_buyer_checklist.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_off00026dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26DFC 5112 bytes
SHA-256: b0565f8c8c8aa23fc1cc8c6e7e865a7bd5a42c6b3ec07cb3a659927273b63505
font_01_sfnt_off00027f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27F3B 11628 bytes
SHA-256: a1703df6223f6ec3da5bbea1a3c5433b3dc1bc2c85a6c851a223a3ca70e999d4

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