Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3df02b6f12587fc…

MALICIOUS

PDF

72.2 KB Created: 2021-03-27 22:25:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e1ea85bed12ce10a7738f0b4645481b SHA-1: 22b597ec93a19df75a98a2efb09a8739ff504f2f SHA-256: d3df02b6f12587fcc5d572e89360789fadfae656337a054e3833e91741aa2552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical detection for a link farm containing numerous external PDF links. The ML classifier also returned a high confidence score for maliciousness. The primary attack pattern involves directing users to a network of external URLs, likely to host further malicious content or engage in SEO-based phishing. No scripts were extracted, but the presence of numerous external links suggests an attempt to exploit users through indirect means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=how+to+soothe+plantar+fasciitis+pain
    • http://nowukusox.mypressonline.com/actions_the_actors_thesaurus_download.pdf
    • https://nabinavupofi.weebly.com/uploads/1/3/5/3/135350319/tebiganuwa.pdf
    • http://vosajizegek.mypressonline.com/46962154910.pdf
    • https://gamalisixidu.weebly.com/uploads/1/3/5/9/135958628/e04154dbc41.pdf
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/d86000b3814.pdf
    • http://gudutisiluzew.mypressonline.com/leperibujezati.pdf
    • http://gonifarej.mywebcommunity.org/tujuladumidovuwo.pdf
    • https://mawosamaretezij.weebly.com/uploads/1/3/4/8/134860838/f9435fb.pdf
    • http://zugapuvu.mywebcommunity.org/minolta_srt_102_battery.pdf
    • https://jowidizikut.weebly.com/uploads/1/3/0/8/130874332/sefitofilo_ponafi.pdf
    • http://mopewogubit.getenjoyment.net/38386333818.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8eddaaba-61c6-42ec-928c-631ec1b41461/selijew.pdf
    • https://uploads.strikinglycdn.com/files/706b32fc-d195-494f-b8f7-2814c59a3d84/35093842588.pdf
    • https://uploads.strikinglycdn.com/files/e9a35a1f-36de-47b1-a90e-77db17f06b49/the_first_law_the_blade_itself.pdf
    • http://dezobod.onlinewebshop.net/biology_textbook_class_12_gseb.pdf
    • https://uploads.strikinglycdn.com/files/24409427-0554-4fd3-a369-08a9e13b9257/32659744783.pdf
    • https://uploads.strikinglycdn.com/files/f7dbdc40-10d0-4f31-a776-4db7c92f03a7/is_the_ap_music_theory_test_hard.pdf
    • https://uploads.strikinglycdn.com/files/64985612-d185-45ee-abcb-a7a70bee1c00/54608537758.pdf
    • https://uploads.strikinglycdn.com/files/72091a08-d989-40f9-858c-947e07e5f86c/what_is_justice_in_society.pdf
    • http://karokifewugasuz.onlinewebshop.net/85645922581.pdf
    • https://uploads.strikinglycdn.com/files/6757f92b-f503-4f46-9e46-3a3dea120533/the_dharma_bums_synopsis.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_off0000de71.bin
f4c8735e619a94110e5b404ffcdfcf9f433f698078948fdbda908152e0370c35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 5156 bytes
font_01_sfnt_off0000f005.bin
66b0cca501bee2b678de6e696971fc976787e945db70c0429fe5b2557b1ca540		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 10500 bytes

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