Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f57834c44e5132…

MALICIOUS

PDF

78.6 KB Created: 2021-03-31 10:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3b1423e9afd807d138c80cac1858fb75 SHA-1: 78a09687bdfaa6702b2d617bf347a9df950c78dd SHA-256: a6f57834c44e513287457a379ce38274bef09c375ad8b717e94918f864104f03
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO scam. The document body, though heavily obfuscated, contains a search query related to ink cartridges, indicating a lure to redirect users to potentially malicious or scam-related websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://gimoguvi.ru/strik?utm_term=what+ink+cartridge+for+hp+deskjet+3636 PDF link annotation
    • http://gabutetidik.22web.org/64785125843.pdfIn PDF document text
    • http://furafofuvobomu.22web.org/82032710212.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/cYifNge/risks_and_rewards_of_space_exploration.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/ig7aePE/chimp_paradox_audiobook.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/MichhES/kakikavotewakanuxiwixo.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/1WMifih/jatakem.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/eifjgDs/pubozewesa.pdfIn PDF document text
    • https://nevipezuke.weebly.com/uploads/1/3/4/6/134652321/vamosiluk.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • https://mikigelovipu.weebly.com/uploads/1/3/4/3/134387596/4218966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417525/normal_603600dddf5e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487201/normal_6030e504e8b02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420449/normal_606374368d95c.pdfIn PDF document text
    • https://kasugokadudibuk.weebly.com/uploads/1/3/4/7/134740653/sorafusujozurubiz.pdfIn PDF document text
    • https://rosanuwafurix.weebly.com/uploads/1/3/4/7/134766820/0bc5d8ca7572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479237/normal_60349b4796cb3.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/mexediluregotif.pdfIn PDF document text
    • http://jezoxegodugorol.22web.org/cinderella_man_film_study_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bapilusigedoj.rf.gd/41260930795.pdfIn PDF document text
    • http://kadoluwanib.rf.gd/load_bearing_capacity_of_soil.pdfIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_cb90a423b37843cdba75425686682f69.pdf?index=trueIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_bda535d8808940a3bda3b4646d069653.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_5d18e2cd7a764db786d5e7c9208a8769.pdf?index=trueIn 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_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 5856 bytes
SHA-256: 629bda4f4e36895a87eceef7ce9333978aea48fd145712c279649316d530a707
font_01_sfnt_off000107ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 10720 bytes
SHA-256: 2a077c64d93528332b82445ee0f0b295e0f11c7c292fbdd194e947ffa19c280a