Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f2db74ea920cc5…

MALICIOUS

PDF

93.4 KB Created: 2021-03-18 05:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 74f5a1fbc5c70500bfe62f6a33b77a6d SHA-1: 4ac2cb99f07b39cf05e9931ab6dbfe66f7c65bce SHA-256: 13f2db74ea920cc59f5b602072ac1669ab18f0f4c60f3ecc5283bc5078504240
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a downloader or a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/wix?keyword=playhome+english+patch+hongfire PDF link annotation
    • http://ig-copyrightnotice.com/boss_micro_br_80_review89yau.pdfIn PDF document text
    • http://geleostone.online/1887765686803tsw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494891/normal_6037069e10572.pdfIn PDF document text
    • http://bozazareter.iblogger.org/triple_bunk_bed_plans.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/2699497561.pdfIn PDF document text
    • https://mefufexuwi.weebly.com/uploads/1/3/4/0/134019004/fefuxuded.pdfIn PDF document text
    • https://wamazuwo.weebly.com/uploads/1/3/1/3/131380988/3212050.pdfIn PDF document text
    • https://rafowatixi.weebly.com/uploads/1/3/0/8/130874563/zirigek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455881/normal_601fd8c339ffa.pdfIn PDF document text
    • http://luziniwanemek.sportsontheweb.net/autocad_frame.pdfIn PDF document text
    • http://labapewuxumawix.iblogger.org/flowers_in_the_attic_trailer_2015.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/1217151907.pdfIn PDF document text
    • http://pshcomonhere.xyz/35886035695crvo4.pdfIn PDF document text
    • http://gsmall.space/loctite_5920_data_sheet6867z.pdfIn PDF document text
    • http://fasad-dom.site/joxegefemarawosufigodsr6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_600f8ce88d295.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://giwofigu.epizy.com/tunuxoguzijo.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_off00012763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12763 5320 bytes
SHA-256: 0ee297ebfeb34fc09f0d23bca953ee41b610207d8b7443dd0b23c37d00f5bf8b
font_01_sfnt_off00013957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13957 9792 bytes
SHA-256: efd14e7790f8abb9a596873bcfd8fca4382da8ea53326dcc219e5ba1977f2d6b
font_02_sfnt_off00015a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A85 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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