Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2224ca33fcf0d57…

MALICIOUS

PDF

77.3 KB Created: 2021-05-02 07:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e19b72f9032eb4c9513b8bb085ea40e7 SHA-1: 255dfece36cd5b78987866f25819a7292080c78f SHA-256: c2224ca33fcf0d570ad97a04d89c96c81cefc002631f21fccf3a9fb04877e407
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, indicating it is likely a link farm designed to direct users to malicious websites. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=transformation+worksheet+math+aids PDF link annotation
    • http://newsportstechnology.ru/verifalurefoguzisojixpjihc.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/n3pIWid/rock_and_gravel_tucson_az.pdfIn PDF document text
    • https://cdn.sqhk.co/kinuneba/dihngja/74998722176.pdfIn PDF document text
    • https://putonikasobex.weebly.com/uploads/1/3/1/0/131070178/9b092ec2d099.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/5058384811808cvd.pdfIn PDF document text
    • https://lusimijibujadex.weebly.com/uploads/1/3/4/6/134677052/wevazulodefakupe.pdfIn PDF document text
    • https://pafirolexorawu.weebly.com/uploads/1/3/4/6/134612045/d7c536287.pdfIn PDF document text
    • https://zejotagidegixop.weebly.com/uploads/1/3/4/5/134522105/fuzefapizi_togobum.pdfIn PDF document text
    • http://lisuzigerob.mygamesonline.org/pedezipaxafivomadifuv.pdfIn PDF document text
    • http://italia-doc.fun/69189963408ega05.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/73916004093.pdfIn PDF document text
    • http://osmosiotzs.fun/skyrim_alternate_start_guide4mrd2.pdfIn PDF document text
    • http://giwudogor.scienceontheweb.net/36869955320.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/fhgggg9/coin_drop_machine_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nufewusuk.rf.gd/basic_topology_book.pdfIn PDF document text
    • http://jixabedumusuzet.rf.gd/exercicios_angiospermas.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_6abcdd70e97f4837ac99dff3eacc3893.pdf?index=trueIn PDF document text
    • http://jiregaruxu.rf.gd/rokun.pdfIn PDF document text
    • http://munogotisun.epizy.com/how_to_be_an_internet_millionaire.pdfIn PDF document text
    • https://52aa71f3-9574-4e96-898b-bb16aa893b2c.filesusr.com/ugd/b13a71_ade70a75e04c4d10b478263de79939eb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 5008 bytes
SHA-256: 048fe8af8e13d82a7fda0d0396ab16e6c60a98a2135c89e5ce912cc28f717ea8
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 10440 bytes
SHA-256: 3dab09a34636f1cb4a5614ae72e07c61d8a4ed9ef4425fd74de792e3c16a0e0d
font_02_sfnt_off000119d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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