Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f52c3c32ec7ca6…

MALICIOUS

PDF

88.9 KB Created: 2021-03-21 21:18:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6ac2c96a396c17589757c90946b0cf3a SHA-1: 24e3b4d9e3193afbcf08ad941a0511b9365007b4 SHA-256: 93f52c3c32ec7ca679aef64a29c4dd7fd79aa61cf123172c9a349c18247f770c
196 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of an SEO link farm and uses a redirector URL to lure users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing campaign disguised as a downloadable resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/strik?utm_term=scout+book+pdf+in+tamil PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387811/normal_603fa15c3661a.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/8232c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453888/normal_604fb5ddca2c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473375/normal_5fcdc48e4a364.pdfIn PDF document text
    • https://xizirasifeda.weebly.com/uploads/1/3/4/3/134344010/tumez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480402/normal_6039724f9f7e3.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/c6ba53e6-9ea1-4e9b-93be-0aa8de816676/3_tipos_de_sistemas_dispersos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e3374b-fe2a-4e21-bf96-8b948b3b0c9c/amazon_alexa_commands_funny.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/risk_assessment_template_victoria.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/79114973886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21fa0845-172b-4817-be27-9628e779c291/accenture_c_interview_questions_for_experienced.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee094cba-6cad-40e5-af88-f1a78db055ad/xomepuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88fba87e-1705-4136-aa83-e620566f168f/is_fairy_tales_shampoo_tear_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/213f6514-8fd8-4833-ab39-8e320a58547a/jumping_spider_8_eyes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b0b39a8-51d4-4b54-8119-1da8b1e487ea/mixajilekopuvegedoda.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
stream_003_off0000ffcd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFFCD 24956 bytes
SHA-256: d30766aa67df46f0a93cdb70a1ed0b02d2b3838b2729f7edfb2cb08783b3af09
font_00_sfnt_off0000edb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 5332 bytes
SHA-256: 34bdc120d6720e0141bcc69303a58b0ab302d6378f029992bb900fce6aac6384
font_02_sfnt_off00013233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13233 10604 bytes
SHA-256: 23a3bac8f8831282431c19ed75c3c6bd97eb3888127fdcc177bc3c8a8a159a1f