Malicious PDF — malware analysis report

Static analysis result for SHA-256 9164a32a375a089b…

MALICIOUS

PDF

86.2 KB Created: 2020-11-17 00:54:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 059edd8477ce0984c8fc0ebc6bdc24c3 SHA-1: 97aa96af17c6e0810e89c74f95d0fff8dd9abe81 SHA-256: 9164a32a375a089b2509d3f656d305dfd24cd800cbf5c7127e68b495d57ff610
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffine.ru/strik?utm_term=what+intermolecular+forces+are+prese PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379732/normal_5f8d06a4b68e8.pdfIn PDF document text
    • https://lexizade.weebly.com/uploads/1/3/4/3/134368494/gowijewozibogixerefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443804/normal_5fa74d3912f6b.pdfIn PDF document text
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/1461145.pdfIn PDF document text
    • https://sulidisige.weebly.com/uploads/1/3/4/3/134318683/1328119.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d8de74b9-5ac1-4819-b896-818dee8fd8db/a_linguagem_literria_quase_sempre_faz_uso_da_norma_culta.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/45965076236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e89b7618-c419-4e98-8766-3497a10ab9b0/roxutizopaxufejipekaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50061fc4-c416-4001-b68c-8e08b0ea1ebf/14103805754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b96b7596-fee1-4755-8e1a-24cf38222f88/52047267200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0ad1a4-a6c6-4119-a273-bc0028b6c98a/pudunoxonuwepon.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/86744175761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb3b06a-c6b5-4744-bdd5-f1f7ca12f83f/venous_sinus_thrombosis_stroke_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af46d41-0910-4e8f-ba9b-020d516a31cc/grammaire_anglais_franais_vocabulaire.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 5152 bytes
SHA-256: 97e7ad31ff3a2010c9c01dfd304fb056e06b2b8413366ee6f80ca3a5e9dd3fb8
font_01_sfnt_off000114f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F1 12276 bytes
SHA-256: 13a65ac766c40f5c4252de3028be398d084b74f1cb907cba38e50ff58a258abf
font_02_sfnt_off00013dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEC 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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