Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f4a50d86cd240a…

MALICIOUS

PDF

67.2 KB Created: 2021-02-12 22:04:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8e6773ea36d84c2862102248dedcc18c SHA-1: 54b2241d9d367f261dc30121f60da16208da0e9e SHA-256: 71f4a50d86cd240a12fdc48c1887d0f485a4e54d85cd0e359ad82f7663996a4f
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or malware distribution.

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://maypoin.ru/wix?keyword=pickaway+county+common+pleas+court+news PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455396/normal_5fc7e2d0775b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452152/normal_5fda2ac47262c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_5fe79eb60b65e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427287/normal_5fed619820f01.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/3782783.pdfIn PDF document text
    • https://jotavitot.weebly.com/uploads/1/3/0/7/130738821/meziwijemoluket.pdfIn PDF document text
    • http://tonerinkstore.com/93383728250xie86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_5fdcfbac8bcad.pdfIn PDF document text
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/virolibeso_juvutesaler_nepituju_jevekubitin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419822/normal_5fe8b89894c7e.pdfIn PDF document text
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/cc166b.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/jeromisixinolib/5226438854.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/24663685662.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_off0000c93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93A 5340 bytes
SHA-256: a6de98b33285d23a494d0ec35bc268dcc296e2ae9c21e4347fcf7f394b8c589a
font_01_sfnt_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 10744 bytes
SHA-256: 3f0b04b8c15120082894c36fc5d665759e2bb26b00d4f224f6a6380c9912fe77

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