Malicious PDF — malware analysis report

Static analysis result for SHA-256 f896b251ae144aa1…

MALICIOUS

PDF

63.4 KB Created: 2020-11-19 06:10:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19a19594f688af9bf965f3f92743269e SHA-1: d6e79a309e0a938e183fcc0f3d63c605f48b10d9 SHA-256: f896b251ae144aa1692028867391b5b2b4c0e09ff47db6e47b1b4af84153dae2
194 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. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for phishing or malware distribution. The document's content, though heavily obfuscated, appears to be a lure related to a reloading manual, aiming to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffi.ru/123?utm_term=lyman+shotshell+reloading+manual+pdf
    • https://cdn-cms.f-static.net/uploads/4408720/normal_5fb26807d5c67.pdf
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/6a23c21741fb.pdf
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/ledonokeberuso-kobifebonewen.pdf
    • https://cdn-cms.f-static.net/uploads/4387816/normal_5f8d44299a2b7.pdf
    • https://sivusemekatew.weebly.com/uploads/1/3/4/4/134491367/7160386.pdf
    • https://zivexipoter.weebly.com/uploads/1/3/1/4/131483036/be6fa99f4d3e2.pdf
    • https://jerimokini.weebly.com/uploads/1/3/4/4/134484757/743885e6a.pdf
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/d0e75e5682.pdf
    • https://cdn-cms.f-static.net/uploads/4459188/normal_5fa9ce8bf0aa5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/59b13990-9230-43da-b5b3-66402a13afca/19538831761.pdf
    • https://s3.amazonaws.com/dorulusof/apkpure_cho_ios.pdf
    • https://s3.amazonaws.com/susopuzupure/20201907284.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_off0000baf3.bin
5a1887352375c440dcccca8f0b02297ef02c9f1dcbcff93505b83fa2a916d643		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF3 5496 bytes
font_01_sfnt_off0000cd86.bin
22dcddce2ca452d31447027fda3c8bdc177565651c5511ab4f5b02422f82de01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD86 10460 bytes

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