Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f122aee32ae211…

MALICIOUS

PDF

82.9 KB Created: 2021-06-07 15:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e0ef64bdf15d60d5a7305d9a8e63a4d5 SHA-1: ed9d69a3740c8dfdb7cfba543bad0e2a5bc8e23b SHA-256: 34f122aee32ae211595fa9d616a6a0f4c9ad63d3eb01bc8267d4133d9e17ea9e
186 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links pointing to disposable domains, indicating a link farm or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://krisoc.ru/pbw?utm_term=csc+form+33-b PDF link annotation
    • https://vodoxuzet.weebly.com/uploads/1/3/2/6/132681632/59c05c7.pdfIn PDF document text
    • https://zikagegivexu.weebly.com/uploads/1/3/4/5/134527251/korigodoxixijo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489976/normal_5fec6fe0209d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443325/normal_6068aef49ba86.pdfIn PDF document text
    • https://vemenujobife.weebly.com/uploads/1/3/5/3/135399872/vasegi_woxijef_wamexukewaf_dogixibazedalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495262/normal_601861ce43816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392667/normal_6035e0564f523.pdfIn PDF document text
    • https://mopawikivitofa.weebly.com/uploads/1/3/4/3/134347346/6cc0a50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488339/normal_5feb18d68d3af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_6058c7041c346.pdfIn PDF document text
    • https://vivuguduwidu.weebly.com/uploads/1/3/2/6/132681484/5633842.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417997/normal_5fe1ea2a62d06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487935/normal_6003be717e30e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_6025e21389679.pdfIn PDF document text
    • https://jiwamotezonadiw.weebly.com/uploads/1/3/4/3/134325797/722669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495526/normal_601c65381c0e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383801/normal_5fc8946fd6eff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_600b6691d8fd9.pdfIn PDF document text
    • https://lutitisuputusi.weebly.com/uploads/1/3/1/4/131437948/2840076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_605f84de00e54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414172/normal_600df89099b6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_6018e7ff0c5be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gediripu.pbworks.com/w/file/fetch/144559104/wikapupepasedu.pdfIn PDF document text
    • http://xodelow.pbworks.com/w/file/fetch/144451323/personal_monthly_budget_template_google_sheets_free.pdfIn PDF document text
    • http://rekadezabo.pbworks.com/w/file/fetch/144727602/casualty_season_34_episode_41_cast_list.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/f/cross_stitch_alphabet_charts_free_download.pdfIn PDF document text
    • http://zeladejan.pbworks.com/f/93812347623.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_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 5024 bytes
SHA-256: be5ce9a8a557ef17af421d1cdd362e5dc027c20ffa0d8814c5694dd16425851a
font_01_sfnt_off000118be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BE 11108 bytes
SHA-256: 1d665e3278aa91d2bb6f5c9ade66aa6fd28f3e735065324997edbf83f4202994

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