Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a033c168ff0c5f2…

MALICIOUS

PDF

83.2 KB Created: 2021-03-27 16:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8a6d12be67334b4288d909e7eab8a88c SHA-1: 1f3eeb0f17c8d97575b5bacb6d65f95e21fdd72e SHA-256: 0a033c168ff0c5f28f0767489c40e9680e674831d3251cf770f9cd218c442cb0
186 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of external links and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/award?keyword=async+javascript+pdf PDF link annotation
    • https://cdn.sqhk.co/suxavawudomo/gjXKicr/vefatixojipogedoxufilo.pdfIn PDF document text
    • https://timemojorejo.weebly.com/uploads/1/3/1/4/131437846/3961273.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/dibukij.pdfIn PDF document text
    • https://setozovijigaze.weebly.com/uploads/1/3/4/3/134383391/vijadag.pdfIn PDF document text
    • https://ponawexem.weebly.com/uploads/1/3/2/7/132740185/botizijar.pdfIn PDF document text
    • https://nopumalazaf.weebly.com/uploads/1/3/0/8/130813483/f0bf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374853/normal_5fcb27b7702f4.pdfIn PDF document text
    • https://bitoranajezope.weebly.com/uploads/1/3/1/4/131453137/cebdd339d930.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/gdPNGji/dipujan.pdfIn PDF document text
    • https://lopowizuxo.weebly.com/uploads/1/3/4/4/134438001/1902564.pdfIn PDF document text
    • https://paratokoke.weebly.com/uploads/1/3/0/7/130739311/207a810441.pdfIn PDF document text
    • http://zupanito.iblogger.org/91133728835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446638/normal_6055902f9fce1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459939/normal_604066da46192.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/kilelelevo.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/spanish_orthography.pdfIn PDF document text
    • http://dudajulasur.epizy.com/bootea_diet_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/89603299686.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_off00010674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 5344 bytes
SHA-256: c5365ae90ca225dc1b8b8903b6a31d8f7dbf128ff054604dd79431dfec055088
font_01_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 11644 bytes
SHA-256: 3d496def299c13433fb3865f9285286c3d35a940a89fbfccf2a41ec1f60008fe

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