Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3ddd0b6d6224eb…

MALICIOUS

PDF

80.4 KB Created: 2021-06-07 08:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 27a2284aebddffd08576aec40996bb8f SHA-1: bdbc7ef878fca45137014595f59b126b2f69f63b SHA-256: 1a3ddd0b6d6224eb7384e64813e4d632f8be2066ec7d971896c98f1e7fefa742
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

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://wastran.ru/pbw?utm_term=transition+words+sentences+worksheets PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410217/normal_5ff1e3e7c7dc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418579/normal_60281d57736f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_60415d0649804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_60b806447a9a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_6046002db169c.pdfIn PDF document text
    • https://lufotoloxa.weebly.com/uploads/1/3/4/3/134318907/1a88be6a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467036/normal_602982dd91684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_6041e2000c10c.pdfIn PDF document text
    • https://nanupubixo.weebly.com/uploads/1/3/0/9/130969545/7802762.pdfIn PDF document text
    • https://nurixuwabojud.weebly.com/uploads/1/3/4/5/134587723/mojot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456728/normal_606e3058acf42.pdfIn PDF document text
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/5e6f4c3738b8.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/3a0523a9-b83d-4c92-91b2-91a568c7c3aa/81425553203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/953c4787-84b5-4313-88b2-5a2100512f4a/curriculum_vitae_formato_para_rellenar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01436137-3c4d-4738-84d7-9b198043c0fb/how_to_program_vector_to_talk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db181831-2525-4b67-bc0b-c3c54d43da17/the_infancy_gospel_of_thomas_full_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3f4d8f4-3797-4061-9cc1-0e5f37e35b53/26402386826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b124fae7-43a6-4609-a3af-897c0938f149/90847751010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/035d28bd-7a01-46c3-b4a4-7350a573a5b2/how_often_does_gamestop_restock_consoles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6964a53a-e127-46f3-84c9-2919f3edc190/bibopilejorinaxakax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5965fb-fe8b-4cc6-b173-b7bcf19e05b1/ashab_e_kahf_in_urdu_part_14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f10affe-b17f-4d08-8308-61eb8cbc0df8/34844177536.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_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 5100 bytes
SHA-256: d4ef0d915d65cc527a02e55d82b04063634f75e1ddcb92bc5324a3453d4d785f
font_01_sfnt_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 10568 bytes
SHA-256: 2bd63fc3c43b189e262fca9de2cc229d088c4bf3cebd990d94b4e429ab41ca2c

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