Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9d10fe013d4b0e…

MALICIOUS

PDF

81.8 KB Created: 2020-12-20 09:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 847b4072c2021b4d1a530c13e0b93d84 SHA-1: 97a1c832453c8ecc8861f35d01bc8c8eb66912ed SHA-256: 4c9d10fe013d4b0e974356d157346b14adf27521d604aad59bf276e0a640f0ec
156 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 external links, many pointing to seemingly unrelated content, indicative of a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffe.ru/strik?utm_term=icd+9+code+for+follow+up+orthopedic PDF link annotation
    • https://mimevomakiket.weebly.com/uploads/1/3/4/6/134693464/ladika_zilan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_5fa466a73b465.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381534/normal_5fcc048262d48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/7762d6d4-dad8-4b9c-9688-910be85f13ea/superior_inferior_medical_terms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74d977e-28ef-4acb-a982-8f64fdeb449d/74448121467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f66e4a6-051c-4557-9369-52688cad6616/lutulosugavelesidiw.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/cemented_carbide_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d4ba22f-e069-4bf8-8aab-a3aa31c48bfb/trapeziometacarpal_arthroplasty_cpt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59cfddca-69a1-4da5-9295-9e49f6ad0fac/ravobolezosiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01a4b157-d94a-4ead-85c1-8d08b49c61d2/sarorogabajopixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b1d8437-b4aa-45d9-a376-277143607fe4/fokawawajikibatuvipu.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 5040 bytes
SHA-256: 3b6242c5821ffe85225f1c4b502a1a0abb3cbeba1bf798ed56f20cc699a00139
font_01_sfnt_off0000fbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 9808 bytes
SHA-256: 2a898ddfb57955726ed7b097ab57968ad7881a826ea7ffe0092737e9bae0d2da
font_02_sfnt_off0001171e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 10332 bytes
SHA-256: e456155e504ccf65f469fad578bfa1f3cda4229a7939f6aa352fd0e4175d08d2

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