Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a95dc99910166b…

MALICIOUS

PDF

84.8 KB Created: 2021-02-15 15:20:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e2ff8c698de7c725bbc4a41f8f1a91a9 SHA-1: 4db8ed19f7f964ac358e172cff932f820b706ef7 SHA-256: a9a95dc99910166b5d6dbda4a37f903067cf6b5576d9a22de58aed9832dbbe54
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, suggesting a phishing or scam campaign. The document body, though heavily obfuscated, contains references to firearm parts and a PDF creation tool, which are likely decoys to mask the malicious intent of redirecting users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=colt+ar+15+upper+receiver+markings PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466165/normal_601905d25c10c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383586/normal_5fcedf8043b28.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/ievjcPY/17845755235.pdfIn PDF document text
    • https://cdn.sqhk.co/pinufizugal/ieieqq4/8249810012.pdfIn PDF document text
    • http://baugroup.info/tukipanigulinibovotu4f50a.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/hcgfhfs/ruzura.pdfIn PDF document text
    • http://storefromit.pro/nowy_wspaniay_wiat_30_lat_pniejmsyo3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470542/normal_60240e09e08df.pdfIn PDF document text
    • https://cdn.sqhk.co/bijowiroma/caSaLjb/bevafufalifigiveparuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_600fc726022e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416790/normal_60027c6ccec10.pdfIn PDF document text
    • https://cdn.sqhk.co/sepunaro/hgjcwgc/56069530114.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/2hghifj/85886275455.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/gdOCibK/freeze_dance_di_halloween.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392647/normal_600474af22975.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485176/normal_5ff3401def892.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/rikolusojidowe6vk7y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417037/normal_60041adb5d8ec.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/Shfibii/geotourism_in_the_philippines.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://fuvovidesom.epizy.com/accelerated_learning_techniques_colin_rose.pdfIn PDF document text
    • http://jajoditad.rf.gd/electrical_system_assessment_report.pdfIn PDF document text
    • http://beroseji.epizy.com/14185011164.pdfIn PDF document text
    • http://refewededuxita.epizy.com/titedijodo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 5456 bytes
SHA-256: 708e06f0e47d50777c2e0ec4b6b9d9fea108dec5b2506a71cb006b6920420c85
font_01_sfnt_off000112f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F1 10928 bytes
SHA-256: 32989e295feb0a0e4e5bc7df0081030b71dcd026d2af2e004b2243b40d06e255
font_02_sfnt_off0001375b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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