Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a4949923a93544…

MALICIOUS

PDF

79.8 KB Created: 2021-02-28 07:45:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5dd13d0804949e91bbb34bc9af209c07 SHA-1: 89fd4de2a25d6000bdcf5a1b876b942426b9e40e SHA-256: 86a4949923a935443a135b5b1bb9a85a0a15163138238687119c42ff17f64a14
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=what+was+the+1917+revolution PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411919/normal_601d2a12bcada.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/52977661851.pdfIn PDF document text
    • http://liwexun.mywebcommunity.org/65528767709.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/what_kind_of_hydraulic_fluid_do_you_put_in_a_log_splitter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410214/normal_5fcf32fb7f3bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491159/normal_601450191240b.pdfIn PDF document text
    • http://aov.one/490823862998tx77.pdfIn PDF document text
    • http://zaliv2k20wowowowoow.xyz/oconee_state_park_directionsa78lv.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/98048583769.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/55254372527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371240/normal_5ff75ba092dbe.pdfIn PDF document text
    • http://markettop.pro/fuwojamoxunur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444123/normal_5ff8c5753e509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_601f402f43e77.pdfIn PDF document text
    • http://busibear.com/judipiwuxmm2sm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5ffe2a28b2bae.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://juludiripo.myartsonline.com/konosuba_light_novel_volume_17_vietsub.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/auxilios_in_english.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_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 5108 bytes
SHA-256: 044db67a8ac98b44f4a28c16fd1cd6fe53bb2421ccfbe4584aaac3a841b0d97d
font_01_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 10164 bytes
SHA-256: 012d0a87bfc4d66b81abc1ab22e2a14c5e8bd4024aff2962799f5f7bc062de4d
font_02_sfnt_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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