Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbc9edd0149c411…

MALICIOUS

PDF

87.7 KB Created: 2021-03-10 05:44:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b926638e5061d19f207ca539ea462458 SHA-1: 2f9d63080ef1d32d14c075bdff5c63af65e0323f SHA-256: 8dbc9edd0149c41196f844f654e472ec11e1548b14bb459041b66264e95ae39e
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous external URLs, including one that appears to be a redirector for a book download lure. The presence of a link farm and the nature of the URLs suggest an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://dugedepap.ru/strik?utm_term=napoleon+hill+how+to+raise+your+own+salary+pdf+free+download PDF link annotation
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/1902140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377410/normal_6035b7b4dad22.pdfIn PDF document text
    • https://gisidamuxifa.weebly.com/uploads/1/3/0/7/130775495/c6280e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493597/normal_5fe7bef73033f.pdfIn PDF document text
    • http://simupujumojata.22web.org/piret.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/laradusa/bts_dna_video_free.pdfIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_86066bd751dc4a3d974bb775d2f2e623.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_0353dc2103b247dfa7c69e69a8c29fbe.pdf?index=trueIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_8be44ac336004141adff030ceb551b00.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widofafane/traductor_ingles_espaol_university_de_cambridge.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_a0cfe057aaa048e8a1dbe2a3727392b4.pdf?index=trueIn PDF document text
    • http://fapibudu.epizy.com/lagu_123_wo_ai_ni_pinyin.pdfIn PDF document text
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_2a5096e607b84d7fad670ffebfededc6.pdf?index=trueIn PDF document text
    • http://mosupixozijet.epizy.com/iarc_asbestiform_talc.pdfIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_6478950759a041ca850d4dc68e0c6157.pdf?index=trueIn 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_off000118c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C2 5292 bytes
SHA-256: a769ba01219238fb9dba04d2719d70673e3d33ed6be85fd00afc1fb0ec342e84
font_01_sfnt_off00012ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD7 11520 bytes
SHA-256: 998c0133d47f353d71b26226670e31fd2a0c9f4b6dae88791de1560da5d06f53

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