Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a47b86983bcadc…

MALICIOUS

PDF

69.3 KB Created: 2020-11-24 10:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4ecb4a0de8ed602a100a54fad8a8658e SHA-1: ccca4cceba5db7436c86a6b8a1f2c9499322c328 SHA-256: c5a47b86983bcadcd43c016f69d8aa08b55fc73eae18331afeb2a4000d937e77
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, directing users to multiple external websites, including suspicious domains like traffset.ru and weebly.com, under the guise of a return policy. The presence of numerous external links and the use of disposable hosting suggest a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/123?utm_term=micro+center+return+policy+open+box PDF link annotation
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/384443011935c.pdfIn PDF document text
    • https://daxuferawul.weebly.com/uploads/1/3/4/5/134592581/kevanigaxosa.pdfIn PDF document text
    • https://kavivapepegag.weebly.com/uploads/1/3/4/2/134235540/vukomabe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f88feb2ae013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_5f97be5e0912c.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/lusilataviludova.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/5476235.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/6741250.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/3346b5aa-2f06-4f64-9229-77e06cd5bdc0/wusev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c0572d-1de2-4da9-b60a-a1bef0a7c3ac/89254508184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f50df0ae-9d59-4d1a-a30d-9adf9be5c483/xitizaxogogomijoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f75061-5ea4-40d6-83fa-6bc87cab78e1/realm_grinder_all_trophies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06412ca7-e7a9-43e7-8816-d8e6a270499d/japanese_kanji_list_and_meanings.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_off0000d336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 4852 bytes
SHA-256: ffd8bf27afa4edc9897086d07af1ae99cb17f152ff4551f7b973d338876b18eb
font_01_sfnt_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 10700 bytes
SHA-256: fa7582213c26c8bebd0e3b4fd713ba7ee4fabafb9261afef964c5143f15ff498

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