Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fa7b365742cc32…

MALICIOUS

PDF

71.4 KB Created: 2020-12-17 13:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f10a82bc9674259dc4cfa0ba65689a23 SHA-1: 916097f1453a107a23f2cdeb155800b879e68aa8 SHA-256: 85fa7b365742cc32f4fe13a2d9aec3961eb3495fe7aa854d4f3ee353bf64c061
214 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 embedded links, many of which point to external resources, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=blue+tiger+headset+pairing In PDF document text
    • https://vijejomikozo.weebly.com/uploads/1/3/4/6/134668467/dobowedemuvi.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/f94233b9-567c-4daa-91e0-74018cf885a6/walmart_halloween_shirts_toddler.pdfIn PDF document text
    • https://s3.amazonaws.com/digigitusuduk/tugilutiwuxinususikafaxar.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/blackmart_apk_app_old_version.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/aac_format_converter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ea4416-cf9e-4643-ac0a-40dcac85106f/86221987972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b68ba17-5e42-4231-ae2f-552c2d0347a5/zatukegedegajekepovofo.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/xisifupinifewuxumobumesug.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/74960738882.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/k_to_12_curriculum_guide_in_science.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe728ff8cdb769c6b5ab50/1606316688811/36356889020.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/levakofujoveril.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76c8c6f-ed69-475b-a99e-467040db712d/39596254779.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_off0000da2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 5272 bytes
SHA-256: 3b9ac0d45ebdd0175a77a9ac379fb5b8e469bf46a1ff14a8b716437cc5a50b85
font_01_sfnt_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 10668 bytes
SHA-256: 4102bd8af855cd66eb4b6851e228f87a67fb684491418ca68706f4057e76d4c0

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