Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff869033b950ad2…

MALICIOUS

PDF

67.8 KB Created: 2020-12-31 17:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d393d59420d21a194c868a7802f802a2 SHA-1: cfac0813bdefc86a45372fb7888f90274f4be19c SHA-256: 6ff869033b950ad28e230dbf5a0c40a77a2b689b3073ee3f34e1327b8a0d5f53
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM' which indicates a large number of external links, with one prominent link pointing to 'https://traffking.ru/strik'. This URL is flagged as unknown reputation and is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

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://traffking.ru/strik?utm_term=metaphysics+is+the+study+of PDF link annotation
    • https://cdn.sqhk.co/girewobo/fRDogdE/79663190249.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/r1hhEgd/74232857591.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/igdhipu/64724890494.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/9ha8Ha9/voice_changer_funny_voice_effect.pdfIn PDF document text
    • https://cdn.sqhk.co/tizarina/icheoec/multiplayer_driving_simulator_mod_apk_all_cars_unlocked.pdfIn PDF document text
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/kizapapovepetosaju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea23512a-d121-4e28-a0ba-92bbbccab80e/30294408278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5bcc797-9e31-4806-9af9-771594d4138d/tp-_link_smart_wifi_light_switch_3-_way.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36409087-a33e-4de0-8fd0-ff7fcc93b491/zenob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8664886-adb9-4736-86af-63ca23be25a4/33383944046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c19176dd-84dd-4148-9be3-32ccd8e99d49/11157798277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9958179a-4259-470e-8d1c-0f95ec8d0ad1/62165115335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/174dca80-187b-4f7f-8dcd-ee8c2ae21dd5/parametric_equations_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25fe1e9e-d4cb-4aa9-b9ae-13a114e0941b/dj_name_mixer_app.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA7 5224 bytes
SHA-256: 575acc0b6077e490a0ee853ac6d035076a020a0d422616707b921b52d7404f7f
font_01_sfnt_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 10792 bytes
SHA-256: feab764ed7dbdbe0c52b60fb7dd478ddc46ccaff652b9e9791f847abb3b24367

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