Malicious PDF — malware analysis report

Static analysis result for SHA-256 118651acd4c8cd37…

MALICIOUS

PDF

114.2 KB Created: 2021-03-14 09:09:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 79d1af4135133ef40300abf34c14aec6 SHA-1: 593a7bc662f4c35792083c720215d88acc056388 SHA-256: 118651acd4c8cd3748739c2308ee63e19df2c33f64dd6c523ce3e07b5568c7f2
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links, with at least one pointing to a suspicious domain (vilenefex.ru) and others hosted on disposable or potentially compromised platforms. The document's structure and the presence of many external links suggest it is designed to redirect users to other sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=lord+of+the+flies+chapter+11+quote+about+face+paint PDF link annotation
    • https://vorujefam.weebly.com/uploads/1/3/4/3/134322124/6161909.pdfIn PDF document text
    • https://mogopefisumiba.weebly.com/uploads/1/3/5/2/135295831/dufusopekidus.pdfIn PDF document text
    • http://ladyso.ru/what_are_the_more_relevant_roles_and_responsibilities_of_an_onsite_coordinatorrpwhr.pdfIn PDF document text
    • https://lobovalosidim.weebly.com/uploads/1/3/1/4/131437181/1873298.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/jfXAqhi/cours_d_orthographe_franaise.pdfIn PDF document text
    • https://zitudoxe.weebly.com/uploads/1/3/1/4/131437236/buwumotimi.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/fokibizez-gizetoj-virupetavaz-jotixezigu.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/5c79de30e18bbc.pdfIn PDF document text
    • http://walkover.me/bevapoxwza2.pdfIn PDF document text
    • https://gujejedadun.weebly.com/uploads/1/3/1/3/131398181/a48e24.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/ghhYGtJ/41258577349.pdfIn PDF document text
    • http://tenp-mail.xyz/koxuxifojutameweczy5q.pdfIn PDF document text
    • http://verification-help.com/non_circumvention_clause_templatemigcs.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://s3.amazonaws.com/kujapomib/84478352398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96730564-4579-45c5-997e-ac11b73be4fc/dejozusaxomotadunemafazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b870dcd8-1f25-4c5a-b664-15ae9cfa2bae/67334137467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df7765e-9dca-437b-92f7-9d70076b9aee/vintage_cinderella_book_disney.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3026edf-bce2-4ab8-9538-b8efbd7feb41/78909517144.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/how_to_make_a_vector_brush_in_procreate.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/past_perfect_simple_and_continuous_worksheets.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_off00017510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17510 5384 bytes
SHA-256: 7e018b607405cb4ca0b22f14f5a2a2fe6807b732f2235dcec227ab1bb92cd695
font_01_sfnt_off00018757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18757 11008 bytes
SHA-256: 6fc6fb2c9f71964f4035399ca962d032b63200f5a98fb55449f35fb875b1d417
font_02_sfnt_off0001ac9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC9A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361