Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a2b385d566a57e…

MALICIOUS

PDF

71.2 KB Created: 2021-03-20 18:15:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 815dd1194d20c0bff74a4135f864a823 SHA-1: 1b2c7b585c8200612da61a6eee33f73c15b335f7 SHA-256: c1a2b385d566a57eb6b0817a3268e77dd411afee09f63198be49d990deb16374
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, with one suspicious URL pointing to vilenefex.ru. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=dream+yuga+110+side+panel
    • https://cdn.sqhk.co/bareziwo/7t9hiA6/gigobemobugezo.pdf
    • https://cdn.sqhk.co/xobanozizesa/HPaYOhg/46700495627.pdf
    • https://cdn.sqhk.co/bogulevim/jdNhamx/virus_stats_for_today.pdf
    • https://cdn.sqhk.co/zolulesar/gigghui/business_administration_jobs_houston.pdf
    • https://cdn.sqhk.co/guxudakakali/RgiAMjb/navololudegusobikok.pdf
    • https://cdn.sqhk.co/jekuzedu/iNiijDP/small_rechargeable_digital_radio.pdf
    • https://cdn.sqhk.co/varomapit/ghchchh/68584335545.pdf
    • http://clientbluebadge.com/start_up_business_budget_templatecd3hh.pdf
    • http://solapp.xyz/38558235138z58lq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_0822186230c84bc4a5bdb9d95acbcc25.pdf?index=true
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_ff1ee257b1974957b43acc7aaa2db5d3.pdf?index=true
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_89af7f0857fd40499b4f54b276678cb1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e00c8b29-0adc-414d-81d5-922df60fc250/the_bfg_cast_sophie.pdf
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_e127d52a86344a7c8f084706871df6e5.pdf?index=true
    • https://b3df6b87-ca8d-4c26-b815-8c697753997b.filesusr.com/ugd/896a32_2926e6a2b94e4d5caf6ca733e8b840b5.pdf?index=true
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_405dc38c5a6645cdbad7e1da2b2f1e22.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fd5ea337-5247-4ef5-8bab-cc0b566605ff/linear_graphs_worksheet_tes.pdf
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_1a7fe1c71a474b1aa7668bc1b49de8de.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6e05fd23-6554-4153-8153-88eae3094ce3/why_is_my_humidifier_not_steaming.pdf
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_108468e8827d4fb3ba33233147c6d8bc.pdf?index=true
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_5901d9b51d1747db8b1c494f7f3bdd75.pdf?index=true
    • 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_off0000d867.bin
f717cdf6da6aa13bfe2b97bd81837e71041f06c841f040d4bc93365e17316253		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD867 5572 bytes
font_01_sfnt_off0000eb59.bin
c8ec9bf18a1d090eb8b6ffe63891de17d1bba2b807f791c9dbeadf9e712c81d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 10716 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.