Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f39152fe828391…

MALICIOUS

PDF

79.1 KB Created: 2021-06-07 04:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8ce782ebb35a20be5bef5ecbf51f480b SHA-1: cd806af60d6a22b121a5bc1195a8b251ce5998c3 SHA-256: 41f39152fe8283914f25bd27df68635d42b1644fe54aa9a84938828264d9471a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a link farm. The primary malicious URL identified is https://mezovuduw.ru/123. ClamAV also detected the file as Pdf.Phishing.Trojan, and an ML classifier flagged it with high confidence. The presence of embedded URLs and the link farm structure strongly suggest a phishing or malware distribution attempt.

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://mezovuduw.ru/123?utm_term=fragment+sentence+worksheet+pdf PDF link annotation
    • https://pelozaxuji.weebly.com/uploads/1/3/2/6/132680784/rofigiganoxirerare.pdfIn PDF document text
    • https://sezunugavekavo.weebly.com/uploads/1/3/5/3/135321765/solufuko.pdfIn PDF document text
    • https://lefoxidegej.weebly.com/uploads/1/3/4/5/134526886/fejemutefaji_kilanukuxaga_xedajomep.pdfIn PDF document text
    • https://tozobaveje.weebly.com/uploads/1/3/7/5/137501006/cc2b90cca1a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8d9da6ef-49f7-480d-b3e0-d7e40db9d122/kebizaxej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebec6b64-f16c-4d74-a7a3-333f369f15db/88003436023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc25fb3-334e-4b24-a355-5723b3a5439a/gimp_2.10_10_tutorial_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf5d6808-2a21-4c0d-9998-8df5ab14241d/best_rated_cordless_phone_system_with_answering_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf77cfd-f6fd-4602-8153-cd44357ef206/7412140377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8d4779-3178-4cad-9e99-42c4b462c111/kuzipileju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/610cf9f5-c5b6-4a7c-8343-b6b265fe22cd/how_to_change_battery_in_omron_pedometer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3877d4f-1a94-4774-aec8-bb364943d814/mebato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85ffafb9-7b80-4223-9e45-2eed709e33d6/96976455688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd2d267b-b42b-4fba-8116-87fae449ab3d/92071669506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10f00cfa-7e4f-4f6f-8009-24db0c19eecd/fezatomuwavugebogodesove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf3358fc-31b9-4891-a1bc-1de1d458e00a/jojosudimesokew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dfe1f51-a9d2-416a-bf92-2c6cdc6412f2/where_are_tux_paint_pictures_saved.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/790e209f-ffab-42d7-b520-80e5ee0db9db/what_are_the_3_types_of_incentives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ac3b9f-f6b7-4de2-b62c-9e79488fa411/how_to_make_money_with_real_estate_rentals.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 5388 bytes
SHA-256: f507f7da529857984c782fc9fa08183483fdfd87f4cb96bf4e5466fcf37791a2
font_01_sfnt_off0000fd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 10668 bytes
SHA-256: 84ac289a6f57b5abe0093f94329425c2d7ebbe293f5ca869975a57e390d977bd
font_02_sfnt_off00012144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12144 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3