Malicious PDF — malware analysis report

Static analysis result for SHA-256 36395790ec2dfc36…

MALICIOUS

PDF

61.7 KB Created: 2020-12-16 05:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 25f14df271116b73aaf9d69cfabfb94c SHA-1: 42e375a9108c2bed1b8c53b34322a9ddc5e64425 SHA-256: 36395790ec2dfc36bcb68d8d48a5e69b74503219b0a5aeeaccad2a77fe35b57d
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffe.ru/strik?utm_term=al+huda+school+maryland PDF link annotation
    • https://fimupekegu.weebly.com/uploads/1/3/4/5/134502303/vezuwenafaz.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/lafomu-fowesutom-dabikituduxun.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/82762.pdfIn PDF document text
    • https://sugasukeni.weebly.com/uploads/1/3/4/8/134878852/farudiwaja.pdfIn PDF document text
    • https://terogoke.weebly.com/uploads/1/3/4/5/134587715/weluvosuwedupe.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/6886ed495f.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/e64580911dce.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/1321876.pdfIn PDF document text
    • https://xuxoxipabixu.weebly.com/uploads/1/3/4/5/134588436/f26d834f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_5fa63a7ceddec.pdfIn PDF document text
    • https://zifevenexi.weebly.com/uploads/1/3/4/5/134528386/949234.pdfIn PDF document text
    • https://gawokuvaz.weebly.com/uploads/1/3/4/6/134656265/zonaro_xinoginowego.pdfIn PDF document text
    • https://tawiwamukuzoba.weebly.com/uploads/1/3/4/5/134595143/telalikezej.pdfIn PDF document text
    • https://gubojipupulep.weebly.com/uploads/1/3/4/3/134359502/fobolenaped.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/f045a886.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/jobavo/68620762749.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/lagusugasu.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_off0000b510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB510 5268 bytes
SHA-256: 1fbfc6d3a9686f6cf1dac3f545a0f9e88c97657121483965d17f9b1aa5451294
font_01_sfnt_off0000c6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CF 10300 bytes
SHA-256: 19c40e1c2df2ba8db5ad7778abf270544670d8eec4136e328d8437431441b82a

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