Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec859b9bef6cbd0…

MALICIOUS

PDF

73.4 KB Created: 2021-06-11 12:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 84b1f7c8be5079eb29a5d05fcd4f4a79 SHA-1: 5b9c370e214f0d3d44a14f360135d7aa254c97e3 SHA-256: 2ec859b9bef6cbd0e267f7bf38601fa57d4e64633d5afd6101284e4443773889
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating maliciousness. It contains a large number of embedded URLs, many pointing to disposable hosting, consistent with a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'iso ubuntu to usb' and 'wkhtmltopdf', suggesting a potential lure related to software installation or system utilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ketchas.ru/pbw?utm_term=iso+ubuntu+to+usb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446635/normal_606caee00a42e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447466/normal_5fd63598da368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452193/normal_605c7500e0aae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502833/normal_605a045dc1136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_6038393ca5b43.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/ffb6c766-9d1b-490a-9f31-a7f63ea7a122/putakumizalulok.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/f/fawigewag.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/w/file/fetch/144665175/61685415670.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144413196/96885001549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a4befe-95cb-40e5-8a4f-8253802243e1/why_has_my_electric_oven_stopped_heating_up.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/mijokosimimurako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f1ca0e-c9d2-4fba-b2d7-2c08d352b02a/the_college_panda_sat_math_free_download.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144421113/89766639998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7d28e9-b5ac-405d-813c-433074dd288c/how_to_become_a_referee_for_soccer_in_tennessee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f09529ee-2572-43fb-9266-6abb77df9ee7/bowonogelotukilagebuja.pdfIn PDF document text
    • http://xuxorunewive.pbworks.com/f/arduino_uno_328p_datasheet.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144805593/hacker_cs_go_free_2019.pdfIn PDF document text
    • http://finatin.pbworks.com/f/13198313608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95fece9c-c1bb-4cd0-918b-32d7f6ca09bc/what_is_the_process_of_anaerobic_respiration_in_humans.pdfIn PDF document text
    • http://dipoziw.pbworks.com/w/file/fetch/144771999/64576947855.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61C 4420 bytes
SHA-256: 463fb77409ae901246bb27b9f42f8131e4c653a1be9c242c4f6dd30a4b6ea789
font_01_sfnt_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 10320 bytes
SHA-256: 9c3d6a6e7bc06a54113321b9b0071e326a80b4448115d002cb1172371f486a98

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