Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ea3409e17e1a2a…

MALICIOUS

PDF

75.9 KB Created: 2021-03-29 06:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6db1c5bb045462326a54c730f7128c25 SHA-1: 9f9b24bee4b3914a07e60e7a8e549d831708229b SHA-256: 38ea3409e17e1a2ac29eb50ad9d19919c65f8728f93894a2e07034ae62ac0e4b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model assigned a high probability of maliciousness. It contains numerous external URIs, with one prominent URL, 'https://baarspo.ru/strik?utm_term=wendy+brown+undoing+the+demos+review', identified as a potential lure. The document body, though heavily obfuscated, contains fragments suggesting it's part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=wendy+brown+undoing+the+demos+review PDF link annotation
    • https://pivamaxisogen.weebly.com/uploads/1/3/4/4/134481881/7949688.pdfIn PDF document text
    • http://voztrans.ru/great_unclean_one_datasheetmvuvv.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/0bbdc74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5ff8f1153a60e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478387/normal_5fe54ed67671a.pdfIn PDF document text
    • http://terem.space/pebuguboro0bll.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/durekiduw-nuzowadetasiko-lujukuribuvezad-nugole.pdfIn PDF document text
    • http://topijakalez.22web.org/ziwegutexes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/koditade.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/knight_frank_hong_kong_report.pdfIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_455941e3e58d45d79832d3bbfc1ca7a9.pdf?index=trueIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_9f9582f67d924ef8b6b2279c85050ba4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/46940556126.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/98184515860.pdfIn PDF document text
    • http://vedegisawopuf.epizy.com/what_is_social_imagination_in_sociology.pdfIn PDF document text
    • http://vexibuwo.rf.gd/provinsi_bengkulu_dalam_angka_2020.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_31554dddf8ad4803b9a0fae37fa51be4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/bruxelles_formation_logistique.pdfIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_36445ca4c69743d8bf6a5be37a7bf37e.pdf?index=trueIn PDF document text
    • http://kaxogesidod.epizy.com/wuzuwupokes.pdfIn PDF document text
    • http://kiroxivox.epizy.com/95166330545.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_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 5404 bytes
SHA-256: 474663b5878fe357b23d1cd0f556004e901504a8ee51d0016cb48a1b19bd96c4
font_01_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 10500 bytes
SHA-256: 3e00d3a4f286de05b866dd4ba6fa45b4e5a83df98b4d2368425db850b8feed75

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