Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c4d48cb1584c9c…

MALICIOUS

PDF

88.3 KB Created: 2021-03-16 20:23:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cb59962bb4cbbfd0cc3db69070c7f232 SHA-1: ffd4f630cbf4a56d164e83e8786f5f593c853767 SHA-256: c2c4d48cb1584c9cc7d43ea666fff16e527e157bb82a43fc17380396a501f0df
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or content-luring attack, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://lozipotod.ru/strik?utm_term=intermediate+piano+duets+free+sheet+music PDF link annotation
    • https://rajuvafawomok.weebly.com/uploads/1/3/4/4/134455823/zufurugop_vaxajikifo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492918/normal_5fed6dc4b9dbf.pdfIn PDF document text
    • https://zadivodewereb.weebly.com/uploads/1/3/2/6/132683121/garevis-velej-nisukajajixesek.pdfIn PDF document text
    • http://stopnutristrike.ru/explosion_box_template_free_svgb03wp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457848/normal_6049d5683a6df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_6044f4bfeb12f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_601d274bb2b7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366005/normal_6001c6f75bf14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386333/normal_5ff427523e808.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485823/normal_5ffbec7c58cf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418781/normal_604d34d05cfc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_602d7c6cf2306.pdfIn PDF document text
    • http://bonusiotsbera.online/pathfinder_2e_character_sheet_auto_calculatingvhwou.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455659/normal_5fe15a505426c.pdfIn PDF document text
    • https://lemabifi.weebly.com/uploads/1/3/4/3/134319461/0f6a99f9f4214a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484363/normal_604674f52d409.pdfIn PDF document text
    • http://sadovik.me/how_to_pass_building_inspectionb5m0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_5fe90b49a4c09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454163/normal_5ffd9a6d7ffad.pdfIn PDF document text
    • http://mxbur.fun/tony_gaddis_starting_out_with_java_from_control_structures_through_objects21v8b.pdfIn PDF document text
    • https://radamokugek.weebly.com/uploads/1/3/2/6/132696621/2597388.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/3a9a2788-c9d2-41d9-8e10-12d213f0ff47/17764695984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c457dba-aea5-4dae-8b97-a8fa86ff8dda/what_factors_contribute_to_soil_erosion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7064d9f-3795-4c36-b32a-e7a4c3737e4c/crafting_and_executing_strategy_21st_edition_case_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b333e42-6e52-4646-b17a-c7bc83eb15a5/how_to_use_tub_clean_setting_on_lg_washing_machine.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 3292 bytes
SHA-256: adba4f9331e0ca9b0a08001b1387461a433938eabe88430b864c6cec38b87c92
font_01_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 5184 bytes
SHA-256: bfb8cbe84b92b8fc419579b46787565c1a2ef5b25e4ab773a8e15aaebd02652f
font_02_sfnt_off00011c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 11924 bytes
SHA-256: 99169832e62a49e1a89e00305253f706a9a11c8f79091f49a00565af663e562a
font_03_sfnt_off000144c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3