Malicious PDF — malware analysis report

Static analysis result for SHA-256 81cdf8ad0ae2bb8f…

MALICIOUS

PDF

82.5 KB Created: 2021-03-21 23:22:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 60dad4c0d0baf8ff5606a8c96dc14cdb SHA-1: 5fec3cb0146ba4e094ffb73a156c085733ab1e50 SHA-256: 81cdf8ad0ae2bb8f66d850abd4cdbf4c5678c9f971fd0b9a1b9bd66529980ded
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?utm_term=how+to+hard+reset+kenmore+microwave PDF link annotation
    • https://sitepofom.weebly.com/uploads/1/3/1/4/131438718/wozuwozawex.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/xZiew64/zasatipa.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/gisifirubosi-sosinozolafe-junozugazok.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/lawejufowo-rixidipaw.pdfIn PDF document text
    • https://zavadogo.weebly.com/uploads/1/3/4/3/134325895/zoxagopudagor_ruzokibodi_fujabodewena_vitotekuk.pdfIn PDF document text
    • https://kebiluxo.weebly.com/uploads/1/3/1/4/131455508/luwaravuv.pdfIn PDF document text
    • https://dofemavuxowag.weebly.com/uploads/1/3/0/7/130739836/gelagegaxulivukawe.pdfIn PDF document text
    • https://guxitokos.weebly.com/uploads/1/3/2/6/132681611/bafubalifefup.pdfIn PDF document text
    • https://nexuragero.weebly.com/uploads/1/3/4/7/134751893/zogeja.pdfIn PDF document text
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/gupegoxamivo_zogebepe_juxewidufukul_lijuxopozijis.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/fubalunosuwuzibe.pdfIn PDF document text
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/vitokaruxugikigi.pdfIn PDF document text
    • https://kapizufon.weebly.com/uploads/1/3/4/4/134486886/fisexidufefagit-dimavijimefu.pdfIn PDF document text
    • https://vulemozebo.weebly.com/uploads/1/3/4/6/134693025/kepadaga.pdfIn PDF document text
    • https://fizegebukuri.weebly.com/uploads/1/3/1/4/131453213/sixixaropida_puxebepevuburoz.pdfIn PDF document text
    • http://godotobekof.scienceontheweb.net/tobunak.pdfIn PDF document text
    • https://gotukedefiwukub.weebly.com/uploads/1/3/5/3/135309477/7255524.pdfIn PDF document text
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/warotan.pdfIn PDF document text
    • https://bojojibapofaz.weebly.com/uploads/1/3/4/4/134478515/9fdbb5.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/dRejjie/space_life_hack_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://tifilow.onlinewebshop.net/lawitegomuk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 5112 bytes
SHA-256: 4cbd9b1ce5841e5e8bedbdfed5fbc6f2f77530febbe4333e50f14aa98fe7afca
font_01_sfnt_off000107e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 11884 bytes
SHA-256: 2c7093e331415326bfea0d49ceecad7272b79d1c7ef7eaabec7861bd5ad16703
font_02_sfnt_off00012e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361