Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f32e1b6ee4fe25…

MALICIOUS

PDF

75.3 KB Created: 2021-03-23 19:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 281172c953d4d8ea019ace25d1ad1867 SHA-1: 44fde8782b24d588a9575ff61dbab2374a444f8b SHA-256: 57f32e1b6ee4fe25b2c6a806b9b5b6852610f3ab7deca64c78c27acbe490b127
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification returned a high probability of maliciousness. The embedded URLs suggest the primary goal is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • 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://jottigo.ru/123?utm_term=formal+approvals+crossword
    • http://pirunumilusarib.sportsontheweb.net/48843133312.pdf
    • http://dududuw.mypressonline.com/christian_childrens_stories_for_church.pdf
    • http://creditscorerepair.info/honda_rebel_250_specsfl5yd.pdf
    • http://bekopomulasebi.getenjoyment.net/donie_pene_wiata_barbara_ann_brennan.pdf
    • http://ropisunofo.mygamesonline.org/physical_chemistry_formulas.pdf
    • http://raguvigawak.mypressonline.com/56492293593.pdf
    • http://momentikshop.space/sijuniwavouqwj4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://10bc5e17-7652-4c7e-9b43-999b3eb3b021.filesusr.com/ugd/5edc69_428cb2fb8c254a12878a7f886a008ca9.pdf?index=true
    • http://tekunobujolid.epizy.com/pelupunuv.pdf
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_5e1c0551c838466fa172b920081b1a0c.pdf?index=true
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_7658ff76dc0843799541d952cdacf439.pdf?index=true
    • http://wokoziguroron.rf.gd/lelenobepoxuxovano.pdf
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_935a46685b104214a747d7d79b571742.pdf?index=true
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_d2686a5801264bbba647103b5cee19ec.pdf?index=true
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_5e845c01d8874b13826c1de5f77e86d0.pdf?index=true
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_8964e4cf73d743448a6626a06f98df9c.pdf?index=true
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_e7322fa29ce544d5955db7fd2f60f2cb.pdf?index=true
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_07ad646c29c8441090021dc41b8ec22e.pdf?index=true
    • http://letituxis.epizy.com/gunafijerimuguzobeban.pdf
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_a3eb6a43336f4a34ba6a188e0d918787.pdf?index=true
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_51083d431c214c7fbcfab57fa2a9f7c5.pdf?index=true
    • http://najaxobefirag.epizy.com/zisetomujulifabatu.pdf
    • http://radizala.epizy.com/vajuguvonizagufo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e1.bin
5f5bdda22a7780d4e050edc2f9f196947bd8e39739dfb2676cf1d513249c6444		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 5328 bytes
font_01_sfnt_off0000fbf8.bin
eca0a81a324b17ee2a983327c20fa26e959edda48686441954e3ddd38f0ddc7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 10576 bytes

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