Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc97138e224ecc24…

MALICIOUS

PDF

66.4 KB Created: 2021-02-22 02:09:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f044d398fbb03fabd9b42825c18479ef SHA-1: 503be262a1098aa46416b5c9c26b375e561d9cd2 SHA-256: fc97138e224ecc242cfbdf53334a3495304fec16fe75eb5542255f9721b1c131
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to software cracks, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://bologen.ru/wix?keyword=adobe+premiere+pro+cc+2019+crack+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479923/normal_5fe625471b356.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/iJ26rhb/vabaxesalad.pdfIn PDF document text
    • https://gilaxaled.weebly.com/uploads/1/3/1/4/131438091/mofonudaloj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401716/normal_5fc8c35f14208.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/waduxedagi.pdfIn PDF document text
    • http://mandarins.space/stickman_epic_archer_mod_apk0hhrt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467032/normal_5fc6d47c4b7c4.pdfIn PDF document text
    • https://rigivopamakor.weebly.com/uploads/1/3/4/8/134869382/zuvenav_venuvume_lolotupirawotu_mubekipa.pdfIn PDF document text
    • https://rikizanasurixa.weebly.com/uploads/1/3/1/3/131379420/6520793.pdfIn PDF document text
    • http://sk-anker.ru/tectonic_geomorphology6pi5y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448094/normal_6000d5622a7de.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/huhahby/battleship_potemkin_stairs_scene_analysis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5ff450a6746fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385207/normal_600f1a1762f0c.pdfIn PDF document text
    • https://zujujoweb.weebly.com/uploads/1/3/5/2/135297083/9560035.pdfIn PDF document text
    • https://cdn.sqhk.co/sojetaji/jjcgdZ2/jewish_women_s_history_month.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC821 5684 bytes
SHA-256: cbb95fa06b930ae789fa474abd3e0c465ea0f451ff8b1055f41ace37b2f1c3ef
font_01_sfnt_off0000db60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB60 10328 bytes
SHA-256: 70c82b48e9308f117dcf56e526201fef03a9b1476a78e2c4f83af447b0242646

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