Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad49a91e94a2a95…

MALICIOUS

PDF

71.9 KB Created: 2021-02-23 00:19:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a1b1f3fc7ce0805e4683f8f9b27c33c4 SHA-1: 5e28d458c2a762080c414ac103c1ac1e3f86299d SHA-256: bad49a91e94a2a95aa0dc6f6914670d377b7c6909e522ac4c1bd241c08bd35d0
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one directly referencing a product search term ('char broil 4 burner gas grill igniter replacement'), suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for such links. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/aws?utm_term=char+broil+4+burner+gas+grill+igniter+replacement PDF link annotation
    • https://fosijegaden.weebly.com/uploads/1/3/4/8/134868146/vapofipoteta_fododumajizuvis.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogivotosu/czeia1x/wezixivu.pdfIn PDF document text
    • https://cdn.sqhk.co/kufusivekogo/Lhehdid/bleach_immortal_soul_character_tier_list.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxozamikoge/jajdXgc/virikuforimaxomovameg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485010/normal_5fd7ae6cb29ab.pdfIn PDF document text
    • https://jebapawobukil.weebly.com/uploads/1/3/4/5/134521284/letuk_deregade_rezutez.pdfIn PDF document text
    • http://bomawowaziwan.iblogger.org/android_one_que_significa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479445/normal_5ff1106e97b4f.pdfIn PDF document text
    • https://firedilem.weebly.com/uploads/1/3/1/4/131407958/dajidivomopidat.pdfIn PDF document text
    • https://tilipigenetuwa.weebly.com/uploads/1/3/4/7/134770736/6461153.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://verafewema.rf.gd/u_like_book.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_off0000dba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 5480 bytes
SHA-256: ed514917013756f992d11691de060e8431c55e66beb0f9232ff5b80a9611fc76
font_01_sfnt_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 10796 bytes
SHA-256: 522d9482e5c62213702c91744b7794b0839ebebd851b9ad3617610deeae3113b

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