Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1cea2357071c76…

MALICIOUS

PDF

74.5 KB Created: 2021-05-31 01:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bd9dd77c8abb2c67736dd7df6496a19 SHA-1: ae4907eebc49509139c3f1bea501fdbd976a37ce SHA-256: 4a1cea2357071c76bac04642412e923b3f7fe4f09eb2f86b5470fa7bb2c007c0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary IOC is a URL pointing to 'gimoguvi.ru', which is likely used to host malicious content or redirect users to a phishing site. The document body, though heavily obfuscated, contains text related to 'Approval status report in sap b1', indicating a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/123?utm_term=approval+status+report+in+sap+b1
    • https://cdn-cms.f-static.net/uploads/4417033/normal_60693181447d2.pdf
    • https://cdn-cms.f-static.net/uploads/4462341/normal_6059e889ebe0d.pdf
    • https://cdn-cms.f-static.net/uploads/4476453/normal_604b171b19fa7.pdf
    • https://sapatipiragibo.weebly.com/uploads/1/3/4/7/134708637/1459074.pdf
    • https://static.s123-cdn-static.com/uploads/4409992/normal_5ff046e941096.pdf
    • https://kisofoga.weebly.com/uploads/1/3/1/3/131383553/8247333.pdf
    • https://cdn-cms.f-static.net/uploads/4390374/normal_60115849192b1.pdf
    • https://wogakidip.weebly.com/uploads/1/3/5/3/135384189/456162.pdf
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5fe43825de2a6.pdf
    • https://static.s123-cdn-static.com/uploads/4388819/normal_5fdef1955455b.pdf
    • https://xikoxuzit.weebly.com/uploads/1/3/4/6/134632277/986099.pdf
    • https://static.s123-cdn-static.com/uploads/4380530/normal_5fdd901173d96.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/43c7e51a-2a0f-4a98-ad73-c6d8bf031a8b/98108049717.pdf
    • https://uploads.strikinglycdn.com/files/8b12d5d3-1950-4429-8af1-9e1d0d07ab59/mexikefe.pdf
    • https://uploads.strikinglycdn.com/files/0c680744-0759-446e-b7b0-79eb36143358/why_wont_my_verizon_ellipsis_turn_on.pdf
    • https://uploads.strikinglycdn.com/files/2d11bf81-89bb-470b-8f93-6d705a31b89b/94788382275.pdf
    • https://uploads.strikinglycdn.com/files/07809947-afa5-4f3e-b855-2d8773ea4afb/99636883361.pdf
    • https://uploads.strikinglycdn.com/files/5ab823df-5581-4b10-ac98-7b87d32948b2/58636163062.pdf
    • https://uploads.strikinglycdn.com/files/04bae548-3e44-447e-aea4-b526e51e895a/46461831751.pdf
    • https://uploads.strikinglycdn.com/files/955ebab5-a29b-4025-9aca-844aad0aa2b8/kelavabolafopo.pdf
    • https://uploads.strikinglycdn.com/files/f596e834-6169-42a3-9860-2f0b5e907622/59740852125.pdf
    • https://uploads.strikinglycdn.com/files/a340be02-5add-411a-832e-a202b0359986/jepuberar.pdf
    • https://uploads.strikinglycdn.com/files/030cd969-616e-4a52-84c9-6fb246b24909/what_is_john_dewey_best_known_for_in_the_field_of_education.pdf
    • https://uploads.strikinglycdn.com/files/ae9aff64-1a2a-441c-a210-6ccd31879195/el_principe_de_maquiavelo_resumen.pdf
    • https://uploads.strikinglycdn.com/files/e04e3e63-5aca-4460-a79b-c533f393d765/percy_jackson_2_cast_and_crew.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e643.bin
0092534a20f497c8c19d9ed90c7229a4c99980de3e28912e1c670619b5cd712b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 5056 bytes
font_01_sfnt_off0000f786.bin
cf713589167c5eab3de1b524b14e2a238a352bc51dc19a6c92667d21acccff0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 10836 bytes