Malicious PDF — malware analysis report

Static analysis result for SHA-256 e733625eb0cb01cd…

MALICIOUS

PDF

75.9 KB Created: 2020-12-01 01:17:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb9f69c53d5532fa11779081c85a59a7 SHA-1: 1cff05e4e2e73798cbc27afd8133a39a1cd2e5ed SHA-256: e733625eb0cb01cdb74306c3b289f4f361ed5123713c4cc49476c0b9df78e903
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs point to various PDF files, likely intended to redirect users to malicious content or phishing sites.

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://trafftec.ru/strik?utm_term=did+i+ask+meme
    • https://lonuxomefuju.weebly.com/uploads/1/3/4/8/134871759/kobusurofogipasez.pdf
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/jimevimik.pdf
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/baviwunenofifetiruba.pdf
    • https://jezagegilefu.weebly.com/uploads/1/3/4/3/134307882/maxoliwujedovu.pdf
    • https://ronesina.weebly.com/uploads/1/3/4/7/134707074/11b20c998.pdf
    • https://bevikafu.weebly.com/uploads/1/3/4/7/134710030/gonitarug.pdf
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/nerat.pdf
    • https://wasutemup.weebly.com/uploads/1/3/4/6/134651280/6244394.pdf
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/f590d245f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/napisakaluja/moviescounter_uri_movie.pdf
    • https://s3.amazonaws.com/fatisake/41452885615.pdf
    • https://s3.amazonaws.com/nuselufuzo/credit_agricole_consumer_finance_annual_report_2017.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3be.bin
fda3013a9d8871140d6d2c143d8cf2ba6075f2ed35d77b93451b848927bc83cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 4904 bytes
font_01_sfnt_off0000f463.bin
d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 3720 bytes
font_02_sfnt_off0000ffc6.bin
57dc56a0892c27e2df0a0a8a6f3145b306ce17c37aba1fb17e86e8a971b151a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 10348 bytes

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