Malicious PDF — malware analysis report

Static analysis result for SHA-256 695e7b9621d24596…

MALICIOUS

PDF

86.0 KB Created: 2021-03-25 21:18:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4591449b7d68b44d9519e299f121fd7c SHA-1: b8f7f087cdd68890eeeba6fc1eaf08cfb5170e53 SHA-256: 695e7b9621d24596f6f5e53b647e24cacf9dff32daa4cc29e5588c7e9b82c517
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm, suggesting a tactic to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=behavioral+marital+therapy+pdf
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdf
    • https://cdn.sqhk.co/lutaxudepoje/vgfidXd/jomivo.pdf
    • https://cdn.sqhk.co/jajotulix/jDiMmji/nodeputumifexolanasavep.pdf
    • https://cdn.sqhk.co/tixuniwe/icciie0/kavinedegojesixikanafowow.pdf
    • https://cdn-cms.f-static.net/uploads/4426062/normal_602192ad9ca11.pdf
    • https://cdn.sqhk.co/mixaluwekitu/heXhiWM/final_fantasy_crystal_chronicles_walkthrough_gamefaqs.pdf
    • https://cdn-cms.f-static.net/uploads/4402507/normal_5fd16d9bbcfcc.pdf
    • https://cdn.sqhk.co/letarezetap/yziikgg/lutejufe.pdf
    • https://cdn.sqhk.co/rifelefiw/hqgj6jd/color_rope_level_10.pdf
    • https://cdn.sqhk.co/gasidonoda/jfhhZqc/5795377160.pdf
    • https://cdn.sqhk.co/xukigipeduve/p6mrG7r/hdfc_ergo_car_insurance_claim_form.pdf
    • https://cdn-cms.f-static.net/uploads/4499319/normal_5fdc4088513dc.pdf
    • https://cdn.sqhk.co/sepokafaru/glTjjhd/30282616780.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_efd36af6300c4650a98d43b3b657c37f.pdf?index=true
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_037de80102234991bff9d6f52383bbb1.pdf?index=true
    • https://691dfa98-c543-4342-b77d-a3d7fbf094aa.filesusr.com/ugd/d55835_29e01a9c6d6243cd8fc9b04c159591dc.pdf?index=true
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_4ca185b5f17e453fb87fd2293e27a921.pdf?index=true
    • https://uploads.strikinglycdn.com/files/55ee6b9f-cd4b-45a8-9eba-3fdb0381ba5d/40249918052.pdf
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_a02dadae3c5f43708ceee10163d973f4.pdf?index=true
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_f8e668f7452549f99955648185a325cc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0d818a97-5b80-4c64-9263-e78722517302/how_to_check_in_with_allegiant_airlines.pdf
    • https://uploads.strikinglycdn.com/files/d98a7d1f-4290-40f6-a2ba-3c432c328cf4/how_to_put_captions_on_pictures_in_word.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011162.bin
07fbd0bb665127b8a726ff3b2a54b3a33e498128ff37761d321ea7b1ffcb89cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11162 5316 bytes
font_01_sfnt_off0001235b.bin
53f6d6f6186a653c4a76f6f0ba2eac360e0332ccedff652eb6c3804170d921a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1235B 12300 bytes

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