Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcbf1af0f5feb11…

MALICIOUS

PDF

74.3 KB Created: 2021-03-15 18:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a81adbbf67160c34a363791c8ddeccfb SHA-1: c92d161a0cd92ee84a489a0a7ea85b023b52cb3f SHA-256: 0bcbf1af0f5feb11f1334245a44829e84de72ad05eeaa81fca0ae0abb45a6c9d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and utilize UTM parameters, indicating a phishing or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://zajinet.ru/strik?utm_term=panasonic+nn-gf574mypq+27l+grill+microwave+oven PDF link annotation
    • https://cdn.sqhk.co/depadukat/ijegjjd/ola_auction_stow.pdfIn PDF document text
    • https://vabiwedewu.weebly.com/uploads/1/3/0/8/130813601/xusijuramewivupifo.pdfIn PDF document text
    • http://vashastrahovka24.ru/ffxiv_ravana_hard_guideiylu3.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuniruf/ibvUjii/45827547466.pdfIn PDF document text
    • https://vojonabof.weebly.com/uploads/1/3/1/3/131383251/5024240.pdfIn PDF document text
    • http://ig-support-service.com/javascript_callback_android_webviewgmidk.pdfIn PDF document text
    • https://cdn.sqhk.co/javajadoj/jjJcvgd/99406471714.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367921/normal_6004f3191aefe.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/FShaGwI/sizusipiwowijuwejidegefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_60472d007a775.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/9jjZUhc/toca_life_city_free_download_ios.pdfIn PDF document text
    • http://prodson.space/874097350712nyti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391925/normal_5fd03f182ac9f.pdfIn PDF document text
    • http://mscgis.net/vuvukuzotevogogusu30q5z.pdfIn PDF document text
    • http://static-get.top/car_raffles_in_californiaoaz43.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/2b38ff92-df60-44c6-82e7-0ea00d971f12/sofewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e918d8c-2492-441c-a77d-c2d99337a41e/95075268863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1096bc06-ffeb-418b-8d39-46ef55b574c7/15487304826.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_ebf47208dd0946a59d0dce2106e987e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d9d4e2-8a2e-4e11-9261-bad3cda322c0/how_does_a_stock_become_a_penny_stock.pdfIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_ee5bf3b422074f0b9ffbd79368e42fe2.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_9c7880ed427b41dba92a0015cd1f8c4d.pdf?index=trueIn 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_off0000e1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AA 6172 bytes
SHA-256: ec50407393e39c78d97f3a2c4cd0b53b020c3c5ae779a70f7afd604094931151
font_01_sfnt_off0000f6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 11060 bytes
SHA-256: e0b5d014044954f3de71390bf71277cba1017b51e01a707b9902b19e940f9bdd

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