Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6a6a1af8f735df…

MALICIOUS

PDF

85.2 KB Created: 2021-03-21 10:31:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 99c79a1c9ed6b2b1047686d3dda13024 SHA-1: bd3cb7494748a3912633e66cfbaab563fbce09da SHA-256: ef6a6a1af8f735dfc95ede0ae6abf4778a36ce8e6bbda0a116dc7d36b4bcf007
286 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document exhibits characteristics of a phishing lure, specifically a 'Recovery secret / private key request' and 'Password-protected archive handoff'. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into revealing sensitive information or downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gimoguvi.ru/123?utm_term=bitlocker+to+go+32+bit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485313/normal_600739dea3342.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/rixabalewotat-webumakejefubap-vepak.pdfIn PDF document text
    • https://mijekonepe.weebly.com/uploads/1/3/2/8/132815105/573fe48c.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/Lihgewp/19618729144.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/how_to_become_a_certified_welding_inspector_in_californiauvfwy.pdfIn PDF document text
    • https://fekunifiso.weebly.com/uploads/1/3/4/2/134266639/gevum.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/kShighc/srs_school_rohtak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481065/normal_5fdcdfd0c2b35.pdfIn PDF document text
    • https://nujalujuxak.weebly.com/uploads/1/3/5/3/135347358/e099d563abbf8a3.pdfIn PDF document text
    • http://study-english-02.space/84465721124uya91.pdfIn PDF document text
    • https://cdn.sqhk.co/zaweniwefi/chemhbL/84782748458.pdfIn PDF document text
    • https://woxolifufoku.weebly.com/uploads/1/3/4/2/134234665/fozudatav.pdfIn PDF document text
    • https://nodazijokavi.weebly.com/uploads/1/3/4/3/134315007/0b4214b1b30f2.pdfIn PDF document text
    • http://zewegirugiputix.22web.org/dafexalenoxaworasulil.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/salilodavo_tavazip_tabazolitasatov.pdfIn PDF document text
    • https://cdn.sqhk.co/nadokikado/SWhi1jc/how_many_free_kick_goals_do_ronaldo_have.pdfIn PDF document text
    • http://thesalle.xyz/55493616659sa7qd.pdfIn PDF document text
    • https://cdn.sqhk.co/mizopopowaze/WTOibjc/turbo_cars_for_10k.pdfIn PDF document text
    • https://dibapanapuro.weebly.com/uploads/1/3/0/7/130776085/6610882.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421788/normal_5fcd04b829a40.pdfIn PDF document text
    • https://pizipeko.weebly.com/uploads/1/3/4/6/134611096/nipisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jelemomibupu.rf.gd/64265400622.pdfIn PDF document text
    • http://muwusub.rf.gd/74763462786.pdfIn PDF document text
    • http://pegufokaki.epizy.com/kifitifixidamul.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_off0001101b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101B 5128 bytes
SHA-256: f7089b4ae31b53562fed507a2b822afafc498a5f97ec188ab187a71593cc2ab2
font_01_sfnt_off000121aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 11196 bytes
SHA-256: 28486a27fe8dd37f737eb1fd68742f8899c480dd91573307b12299e6809a9fad

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