Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3082bc7605a339…

MALICIOUS

PDF

72.5 KB Created: 2021-04-07 20:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acada39dcd87a8852dc19f1dbe9f11f8 SHA-1: 51c9b01b87b0550d5c697137fe7bb77ed2bd1686 SHA-256: df3082bc7605a3395559ca1980bcf6fd324b32cb84bd8eaf19aa6e912bd3a7a6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/123?utm_term=bogan+film+songs+free++starmusiq
    • http://bumawusuka.mypressonline.com/dozexuzapaba.pdf
    • http://zokoxakabu.medianewsonline.com/basel_convention_on_hazardous_waste.pdf
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/5693396.pdf
    • http://lotibamuzuti.scienceontheweb.net/lean_6_sigma_training_online.pdf
    • http://vaxenovutejuzid.sportsontheweb.net/lakasatakas.pdf
    • http://vigikigopaloze.medianewsonline.com/16111536569.pdf
    • http://gepokupaburorew.mywebcommunity.org/is_the_exorcist_series_coming_back.pdf
    • http://vaxenovutejuzid.sportsontheweb.net/what_did_the_ancient_mesopotamians_look_like.pdf
    • http://worameruvejaka.mywebcommunity.org/toxobomegozovu.pdf
    • https://lezanixopedem.weebly.com/uploads/1/3/4/8/134886347/gafodefo-dosamozowopelav-vegedoraneleno-jifeturegale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/da0e2928-e55e-4e7d-a0ae-cee5a31ed54a/vijaboluzesonozojev.pdf
    • http://titasukutisun.epizy.com/amarin_tv_guide.pdf
    • http://vekejuf.atwebpages.com/32149287715.pdf
    • http://sujunutab.atwebpages.com/que_es_el_briefing.pdf
    • http://venonoval.rf.gd/dungeons_and_dragons_character_sheet_3.5.pdf
    • https://uploads.strikinglycdn.com/files/889053aa-2c0f-4980-9857-9bf5de80e27b/27581972709.pdf
    • https://uploads.strikinglycdn.com/files/f993817a-9db2-4ac8-85a3-79e410bef95f/national_competency_based_teacher_standards_philippines.pdf
    • http://zalatikewal.atwebpages.com/biodiversity_and_its_conservation_ugc.pdf
    • http://rorokepu.atwebpages.com/transistor_biasing_circuits.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d085.bin
86edf17ddfdcdb9aabbdd212501e529d29037f4e49e7b82cbe02de543e72cf5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD085 5144 bytes
font_01_sfnt_off0000e1ec.bin
9b0465d7a266a6a0871d297a85198fafd9ad23eac14d24749a676fb3908954e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 10724 bytes
font_02_sfnt_off0001067e.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 4324 bytes

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