Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c942de1cb49a2bc…

MALICIOUS

PDF

74.6 KB Created: 2021-03-08 12:33:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b5076f23eb2668fb31d12450dd82cd8c SHA-1: bbcd97e0a9e286266196f4d1ef8cafb6846a702d SHA-256: 5c942de1cb49a2bc108e63c9ae2aed10b435c5c77c856ba15dfc57daaa99b5fb
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to potentially harmful content.

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 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://seumenha.ru/wix?keyword=the+valley+of+fear+summary+pdf PDF link annotation
    • https://losebevaxefot.weebly.com/uploads/1/3/5/3/135347065/tojetuwumuseg_biwijifu.pdfIn PDF document text
    • https://cdn.sqhk.co/zosikoto/qhilpAW/fimilerabedasogitadef.pdfIn PDF document text
    • https://berapozi.weebly.com/uploads/1/3/0/7/130776213/fizevolaguzo.pdfIn PDF document text
    • http://jelesanu.iblogger.org/whirlpool_cabrio_platinum_washer_fl_code.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/hdShaha/light_blue_room_what_color_curtains.pdfIn PDF document text
    • http://zulurasovuguloz.66ghz.com/fawaniridofunebagitifewu.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/jzjih8s/espn_nba_ranking_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/iiZ9yRt/nilelaziretosoxutore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_ec2f951c904f484e8374b9053c5e7278.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedimuta/nice_guidelines_copd_july_2019.pdfIn PDF document text
    • http://wegejubofiba.rf.gd/145105167.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_d78618f47c4f48a7b7af91113f44bf26.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/janodojivi/mepazojusuzetaneladevel.pdfIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_f45d016d0b8b4204b67cc08d374ec670.pdf?index=trueIn PDF document text
    • http://babokad.epizy.com/old_navy_dress_code_policy.pdfIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_e676c98ab47f41abbaab6b2c51592b4b.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_0cd1bf8d597e4fd0a85318230761a014.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/jesowikuvupumuji.pdfIn PDF document text
    • http://nilidori.rf.gd/liwodigugovodexavor.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/2317220017.pdfIn PDF document text
    • http://baxodivol.rf.gd/dorodafebodijotulejumasi.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_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 5392 bytes
SHA-256: 92ecadd90cff4c3ceebc15470e93575f348cbed6972e81e4e3dfb4c2844c4e3a
font_01_sfnt_off0000fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 10016 bytes
SHA-256: 11af539cda4d5c12b3e700db20b6369eda567309d4dbba01acb9492e878d790b