Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07a8c90d4cdba3c…

MALICIOUS

PDF

76.3 KB Created: 2021-02-28 07:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 90fa2cc4c73359354ba4651129076607 SHA-1: e12ec9910cc0d700480cbe58b303d22cb520cb5a SHA-256: a07a8c90d4cdba3cd97c0ad4ebcdd87f27ce12987e81e7c6ddb847f13d618804
184 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting and are flagged as malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users to external sites, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

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
  • 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 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.
  • 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://yafferge.ru/award?keyword=how+to+say+yes+you+can+in+french In PDF document text
    • http://fejukoturig.medianewsonline.com/love_yourself_trumpet_solo_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/xUghUii/avenger_xbox_one_game.pdfIn PDF document text
    • https://cdn.sqhk.co/mifopanikil/hgDhhgj/star_trek_online_ground_combat_guide.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/tikawunafomupagu.pdfIn PDF document text
    • https://mofizuzu.weebly.com/uploads/1/3/4/3/134316779/lebonurudigafujoxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497082/normal_5fe2933b81ac5.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/69693220084.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/peavey_classic_30_weight.pdfIn PDF document text
    • https://cdn.sqhk.co/zoravuzulop/je1rjaq/27427004660.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368250/normal_5fcebd92cc127.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451932/normal_5fc7675aae0c4.pdfIn PDF document text
    • http://potuxoposutu.medianewsonline.com/kojixuxavigisipewur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_5fd1d2506c4b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/48111193081.pdfIn PDF document text
    • http://kegipufi.rf.gd/xijob.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_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 5092 bytes
SHA-256: 8193d6464dedda1a3d797fbcd0c84b2f0c8c82c3dd1a47dc3437136a444e2ac3
font_01_sfnt_off0001013a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 10184 bytes
SHA-256: c03e03d471b5313c7711df5d2ff4b94dc770621d9171d60c0337d4a3e792e6ac

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