Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0c11c55f6b887e…

MALICIOUS

PDF

74.8 KB Created: 2021-02-18 00:55:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: cfeb148844241cfeef5f0195ae4274b6 SHA-1: ee262d8c895617672c5d1242f27228289e9ff290 SHA-256: 8e0c11c55f6b887ee5441b68a4b44d5d30221736cd2c603812b5d3992f9d1dc2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs that are part of a link farm, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown-reputation URLs strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to software activation keys, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://baarspo.ru/wix?keyword=windows+8.1+pro+build+9600+activation+key+2018 PDF link annotation
    • https://cdn.sqhk.co/wisisatofife/LOijugf/jinikada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_601107cb23948.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/V7jjqDQ/58679903222.pdfIn PDF document text
    • http://getyourcredit.info/sofaxova1bn.pdfIn PDF document text
    • https://kubazabuz.weebly.com/uploads/1/3/4/8/134885093/5dd4f7c3c7490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490125/normal_5fd7f828d7a99.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/nnidhgQ/angry_birds_2_bubbles.pdfIn PDF document text
    • http://detonic-shop.website/the_best_salesman_in_the_worlds2bln.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/7839507.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/lukegobefiwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_5fd31971a6116.pdfIn PDF document text
    • https://mikotefi.weebly.com/uploads/1/3/2/6/132695671/sopepuxuzevuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 6400 bytes
SHA-256: 6a865639d2c60ec93f7b1ca38ce93513fa1fe47e35dd4050ef16068ef0a8d6dd
font_01_sfnt_off0000f834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 11168 bytes
SHA-256: c0abb0fcb60359a0357eb373aa427a75615e951ae0cfff7394062ab7397d3009

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