Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7d8e9b625da899…

MALICIOUS

PDF

77.1 KB Created: 2021-03-04 06:16:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d554a9592687fdcc785afe62cf1b1864 SHA-1: 08ddc0c3122157a5019a2be9016b37d721185377 SHA-256: 6a7d8e9b625da899811be5d48d9fd2f04ececb1ec66b12d48fb4458757e0ff0f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which is unusual for a typical document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/award?keyword=miss+america+speech PDF link annotation
    • http://rigipufefe.iblogger.org/xokuwoxedimu.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/9477055.pdfIn PDF document text
    • http://graatorama.space/who_is_r.a.b_in_harry_potter20exm.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/hh7KUhb/minecraft_classic_texture_pack_download.pdfIn PDF document text
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/5890804.pdfIn PDF document text
    • http://bcipreactivaperu.com/xbox_game_streaming_for_android4024u.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/hhjjcgi/tewolegozamogonimiroxega.pdfIn PDF document text
    • https://safubijob.weebly.com/uploads/1/3/2/6/132682970/3524385.pdfIn PDF document text
    • https://najovukuno.weebly.com/uploads/1/3/1/4/131453374/95fccc13.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/5403741.pdfIn PDF document text
    • https://xekawipafamut.weebly.com/uploads/1/3/4/3/134328312/a66bdb9.pdfIn PDF document text
    • http://snt-br.ru/xagosonuzopexirujelin58hy7.pdfIn PDF document text
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/5985010.pdfIn PDF document text
    • https://mumunemifuber.weebly.com/uploads/1/3/1/4/131406104/fejagigug-rofeviparoxa-sidogev.pdfIn PDF document text
    • http://rikeropovi.22web.org/c_o_kancharapalem_online_movie.pdfIn PDF document text
    • http://bet-info.ru/shrek_forever_after_torrentzyo9j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://favukimasinete.rf.gd/lab_equipment_worksheet_part_2.pdfIn PDF document text
    • http://bawavejukedosuv.epizy.com/vosigaz.pdfIn PDF document text
    • http://vutupaxuvidebif.rf.gd/lugufu.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_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 5144 bytes
SHA-256: f1a4c94b3ab8f3ef7be133e21831ace1cf28021a17702894a63c5919d3bb1955
font_01_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 10452 bytes
SHA-256: ceb23f0602806b958ce22313c26214494470a4f5a158180541d1bdd7d64be5b1

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