Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e00521df01b6c09…

MALICIOUS

PDF

76.3 KB Created: 2020-11-21 16:14:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5abd5e24f2b6c521e26e6fa54f0fc1d4 SHA-1: 152c1cf3e3f5504475c964f4e3c418699c942e08 SHA-256: 4e00521df01b6c09c524d35e1214022fa130ee99cfa44f9d532f1ba2da0a116a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute malware or phishing content through these links. The embedded URLs and the PDF structure itself are the primary indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffine.ru/123?utm_term=dr+who+enemies
    • https://cdn-cms.f-static.net/uploads/4428043/normal_5f9fe247e285d.pdf
    • https://zinexosodolawiw.weebly.com/uploads/1/3/4/2/134235462/rudibeteki_lapazefitir_rusabutazipagov_xokadese.pdf
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/fuvivuxedutizi.pdf
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/9944119.pdf
    • https://gotumofavi.weebly.com/uploads/1/3/4/6/134602885/8204257.pdf
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/dorimafupobaxowowaxi.pdf
    • https://rusuligoxajikug.weebly.com/uploads/1/3/4/3/134399392/9946117.pdf
    • https://xifamosavujefiv.weebly.com/uploads/1/3/4/4/134457952/nowijulalitipefa.pdf
    • https://cdn-cms.f-static.net/uploads/4386073/normal_5fabc971b4597.pdf
    • https://damelexivukek.weebly.com/uploads/1/3/4/7/134771288/d32a128.pdf
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/7196485.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/78290160-5400-4806-88e8-4fd2854fe5f7/minecraft_portal_gun_mod_bedrock.pdf
    • https://s3.amazonaws.com/wajibile/toefl_grammar_test_sample.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1a.bin
bbeac7972490b9903bd09bede2226bcf50995d7dc5fec0b2e8145f07a020e53d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 4772 bytes
font_01_sfnt_off0000fe40.bin
f86c0004daefe351097fcd622af595bff5d51180880b814c1d1e698340b14b39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 11396 bytes

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