Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4b0d972fa42922…

MALICIOUS

PDF

84.1 KB Created: 2021-05-22 21:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 847cb73d94999ed50958d16cb8ff7c64 SHA-1: adba12f955cde3348777dd724cc59772af1c488a SHA-256: 3e4b0d972fa42922522316b4c7f77956ac10fda082022fed0a079b77bd61b38e
206 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links pointing to other PDFs hosted on various domains, suggesting a link farm or SEO manipulation scheme. The presence of a callback lure heuristic also suggests a potential phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/strik?utm_term=2013+international+prostar+warning+lights PDF link annotation
    • https://leduxuma.weebly.com/uploads/1/3/2/8/132814900/69bffbea823201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498978/normal_6046c0e0c6114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_6038649accf0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392215/normal_605493de2237d.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/814e823e64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478438/normal_5ffbb06a140ad.pdfIn PDF document text
    • https://retizobokeli.weebly.com/uploads/1/3/1/0/131070240/xonobaga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474997/normal_5fe0d9a13cc76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416940/normal_60469d20e8f48.pdfIn PDF document text
    • https://kififapowugix.weebly.com/uploads/1/3/4/6/134685489/zebegebivowo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_606d6b6dbfa8c.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/xigugumap.pdfIn PDF document text
    • https://fapufeloku.weebly.com/uploads/1/3/1/0/131071019/0fd8ce5b48.pdfIn PDF document text
    • https://kivepuwepadile.weebly.com/uploads/1/3/4/3/134392404/mirusilivivas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470399/normal_6052f09e2306e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470222/normal_6044651c52614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_6051724525cf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425514/normal_6041f80f198ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_6051c162665fd.pdfIn PDF document text
    • https://rifedisivivuze.weebly.com/uploads/1/3/2/8/132814279/1f27b8b9.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://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_off0000feb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB1 5356 bytes
SHA-256: 299cb54a9d62fcd2248a0ec385c982f671525a26947c71c3db523fffd3fe3953
font_01_sfnt_off000110dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 10764 bytes
SHA-256: 3a25b4686bf7e52bb6a11891dd132bae433df87ba2415609b9b85ba5d5347709
font_02_sfnt_off0001350b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350B 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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