Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55a226951a3868c…

MALICIOUS

PDF

73.0 KB Created: 2021-03-18 08:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 171363b17f5d900d39fe28706e41bb3f SHA-1: 6bc86b12e15de97193d6636f5d3300b5cda016ca SHA-256: f55a226951a3868cd7865594687003059147c04824d78772a359121553d13e64
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, particularly those pointing to PDF files on various domains, suggests an attempt to create a link farm or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/aws?utm_term=original+d%2526d+dice
    • https://noxitituruvid.weebly.com/uploads/1/3/4/9/134904787/9514685.pdf
    • http://ewop.space/423782669475e3tv.pdf
    • https://zifimebitumane.weebly.com/uploads/1/3/4/2/134236425/8f66d62a7b.pdf
    • http://worelimupuvefam.mywebcommunity.org/articles_of_incorporation_new_york.pdf
    • http://wirobigi.medianewsonline.com/56008486811.pdf
    • http://ramidavukul.medianewsonline.com/creative_writing_exercises_for_dummies.pdf
    • https://xuwawimo.weebly.com/uploads/1/3/0/7/130739806/xanimoladubiruvibufi.pdf
    • http://likedizar.medianewsonline.com/lalawewux.pdf
    • http://atomyimperial.ru/what_types_of_research_methods_are_used_in_psychologyrsxta.pdf
    • http://dabosesavedevet.medianewsonline.com/pevubu.pdf
    • http://avtovishki-msk.ru/rihanna_man_down_song_videooeceg.pdf
    • http://keepxufi.space/33495560742q4nlo.pdf
    • http://bilkan.fun/25001420317mqm66.pdf
    • https://kukutapiroboj.weebly.com/uploads/1/3/4/7/134712573/66719bde0b38bbe.pdf
    • http://calipshatngaccs1.xyz/vufagenasimekunurota48xsr.pdf
    • http://nunovoxiwanafuz.getenjoyment.net/zomew.pdf
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/6984044.pdf
    • http://sakivometo.medianewsonline.com/98041164598.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fufudaloxola.onlinewebshop.net/nofezofesopin.pdf
    • http://xefiposokupama.myartsonline.com/56846354398.pdf
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_357a3e0407334ce790279541a26ff51b.pdf?index=true
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_e569057a192f4e9d9571a3b2e9fb3e7b.pdf?index=true
    • http://romepasuv.myartsonline.com/union_budget_speech_2020_19.pdf
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_d924617e722a458d945e325193b175bf.pdf?index=true
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_73eeef47743943bfb8822255641d1bff.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_off0000e20f.bin
74f377238c640afa09c941b108db59369c394899c0223aa83f53447398938192		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 4840 bytes
font_01_sfnt_off0000f290.bin
eb4f37d23055bfd728fa2dc864dc9dc7b8287f51241ecf6e561f89d4740d923a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 10756 bytes

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