Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b603ce0b81cc600…

MALICIOUS

PDF

80.0 KB Created: 2021-03-28 16:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6b44348f876e85bf12a6f27c449b8480 SHA-1: 3e2d5f5a69f9531126c5d2f6ea8bf66d223ed9ed SHA-256: 1b603ce0b81cc600a3564c1283825b3ebf3c1d5acea029d2d22aaa8e2e221cdd
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a common technique for delivering second-stage payloads or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://mezovuduw.ru/123?utm_term=bain+capital+healthcare+private+equity+report PDF link annotation
    • https://xugirudubup.weebly.com/uploads/1/3/4/3/134332480/ninuzesowazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471467/normal_5fde9442a3c7a.pdfIn PDF document text
    • https://votilolezin.weebly.com/uploads/1/3/4/3/134307270/kigopitowexitoj.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/fwhg8z7/57888913666.pdfIn PDF document text
    • https://xukizawumu.weebly.com/uploads/1/3/1/3/131380236/rosekatuxire.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/7dd34181396bb.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/ghi7idm/zombie_chasers_short_summary.pdfIn PDF document text
    • https://nidoziba.weebly.com/uploads/1/3/0/8/130873853/paxamigodetolu_vukenurupu_redesepalak_guwaja.pdfIn PDF document text
    • https://norakefepasuki.weebly.com/uploads/1/3/1/3/131382134/datidipupaxapi.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/QWimgfP/stickman_and_gun_3_apk_hack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_6038e4b951d3c.pdfIn PDF document text
    • https://telavepifamika.weebly.com/uploads/1/3/4/3/134352802/pujoladav.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CFgdiND/wobokosomapodotiw.pdfIn PDF document text
    • https://penaveligatoka.weebly.com/uploads/1/3/4/3/134314422/raxutixa-kakinejif-gudevopevawon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428341/normal_601a11095ce91.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/erBjphg/line_color_matlab_rgb.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/zefuzi_tizevatajerek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_600d789584cf9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_0673a32be3f34772b942c4f7586af650.pdf?index=trueIn PDF document text
    • https://16b16ea1-1eac-4681-bfdb-39d0b7b0c60a.filesusr.com/ugd/d6b497_3fa08a62ac314506bedf3c5c7204b951.pdf?index=trueIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_166f5f6622444704a4bd75a1ebf28bd0.pdf?index=trueIn PDF document text
    • https://8035c368-62b5-4e0f-b07c-73fd2baf85c9.filesusr.com/ugd/2ee8d4_50c37539b7294140851af064fec58b01.pdf?index=trueIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_3f56b9b06ac34fcf8bf606a6d15bce09.pdf?index=trueIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_d0ab76424cf640509b4ee507d3879d38.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_6e10ed2478ee4cf9b7a4f9cb320f2ba9.pdf?index=trueIn 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_off0000f68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 5180 bytes
SHA-256: 45d6808468b2b92b61d220973947adf2390208ccdbb7095b24a95dd202bdae7b
font_01_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 11972 bytes
SHA-256: 5af95634b5f8037fb9f6f4f2df3178e900f29caca8b3130379bb71422c894a91

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