Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93927bbbf3a0256…

MALICIOUS

PDF

79.3 KB Created: 2021-05-03 22:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f473b55ed159b693434e38161ac7394e SHA-1: 946d18be39cf208e044bd6d26eb1bd2200c67abc SHA-256: a93927bbbf3a02565192595a1d0730aef1556e8f6182ce828e3bed1f959de115
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 pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=travel+smart+conair+luggage+scale+battery+replacement PDF link annotation
    • https://cdn.sqhk.co/lazujanaziri/HicTnie/meteor_shower_atlanta_tonight_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374022/normal_5ff31c224d5c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498404/normal_60038ee3a411a.pdfIn PDF document text
    • http://rifijetuvijilam.medianewsonline.com/zatadakibuxipeguvuxusi.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/dietrich_bonhoeffer_life_together.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470696/normal_6069f6ef9f82d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_5fd664cd4fcaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_605f6d29b365e.pdfIn PDF document text
    • http://gekiwejal.scienceontheweb.net/burkitt_s_lymphoma_in_child.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/2571079105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448542/normal_6024624288dbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475382/normal_5fe915a721a33.pdfIn PDF document text
    • https://cdn.sqhk.co/muribirigim/mhag1lC/zombie_hunter_the_dead_killer_3d_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_602560fa50581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450045/normal_6053b1b8851cb.pdfIn PDF document text
    • https://cdn.sqhk.co/ditutafewaw/cujhhfb/gotalk_express_32_boardmaker_template.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/hhhaWif/the_office_boss_s_day.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_6f42f0cc963c4cd6ab61385893c7ccc9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farowug/dodimerixaj.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/bioshock_infinite_ost.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_e7d16297f6df4fb49d0899e4f3b02706.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_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 5504 bytes
SHA-256: 031cca6db3873dc801518663fe6e8b890cc17fd9acbcd9804e9535769c0c4e90
font_01_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 10556 bytes
SHA-256: 4adf1a45b4d068adbe71776d6a88e735d5bcf587e4f20969925985480e227cab