Malicious PDF — malware analysis report

Static analysis result for SHA-256 412f73aa6672141c…

MALICIOUS

PDF

77.1 KB Created: 2021-03-18 23:12:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d6365e61f28a77f71c50a6f0159e942 SHA-1: ae13b1a0cfa8fb3accd53363236c55293049e23e SHA-256: 412f73aa6672141cc9455ec1510457a51670d2480b59279e0233e105648cacfc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/strik?utm_term=samsung+galaxy+tab+a+sm-t350+16gb+8%2527+wifi+tablet
    • https://cdn-cms.f-static.net/uploads/4473035/normal_604e6af1df79b.pdf
    • https://cdn-cms.f-static.net/uploads/4385197/normal_602ae279d7616.pdf
    • http://milanbeachs.space/computational_fluid_dynamics_course_in_canadaun17h.pdf
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/zaged.pdf
    • https://cdn-cms.f-static.net/uploads/4410204/normal_601d369db5e98.pdf
    • https://gudivolopuna.weebly.com/uploads/1/3/5/3/135346868/2c54561.pdf
    • https://cdn-cms.f-static.net/uploads/4374521/normal_600f20becac8c.pdf
    • http://www-sfr-fr-monespace.com/rangers_of_oblivion_rifle_guideetxzz.pdf
    • http://latencfsrt.space/paxadokisofedezedade1hisy.pdf
    • https://cdn-cms.f-static.net/uploads/4369324/normal_602b08c856433.pdf
    • https://static.s123-cdn-static.com/uploads/4393638/normal_5fec517d8f4a9.pdf
    • https://kizinuraximi.weebly.com/uploads/1/3/4/4/134446503/af0a49d.pdf
    • https://cdn-cms.f-static.net/uploads/4379844/normal_600a6868e0eb3.pdf
    • http://vehicleinsusa.com/le_prime_pagine_de_la_gazzetta_dello_sport7l5ih.pdf
    • http://healthytrands.com/25830718475hioug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_c26a33efe694417a8af5bf043734a982.pdf?index=true
    • https://s3.amazonaws.com/dotivaf/753071325.pdf
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_9835200a635647c4a65682ccf399bf3d.pdf?index=true
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_296df8e84d72491fbe7d67f58e6e3c34.pdf?index=true
    • https://s3.amazonaws.com/wesezuzuvalirik/sejixosetekos.pdf
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_e2446231d7e24ec0a465301533749060.pdf?index=true
    • https://s3.amazonaws.com/murudute/bimetikilogos.pdf
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_337734737129430c8fb0613853c99a5a.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_off0000e83e.bin
93e1fc240715b59e976a06f75ac32ad60a86e8966fc6cb469523fd3f86910c46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 6392 bytes
font_01_sfnt_off0000fe1b.bin
bedab54a7709e0a8380d063670363adb1df258fba1c83a7f4478538d04fe6ba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 12028 bytes

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