Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2177f9c77fff1ae…

MALICIOUS

PDF

69.3 KB Created: 2021-04-29 04:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7a7bfed53b3eba81e23e74e640488e3e SHA-1: d7741bd39e7343ef32d48d6763432b7b0b0382b4 SHA-256: f2177f9c77fff1ae5d67ed6515e5c4603190067f3e3cd592b6af8b5bceea6549
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs and embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to printer error codes, likely a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=canon+mg2220+printer+error+codes PDF link annotation
    • http://lopixerirerenex.mywebcommunity.org/pdf_splitter_free_software.pdfIn PDF document text
    • https://zewakifu.weebly.com/uploads/1/3/0/7/130740590/8214208.pdfIn PDF document text
    • http://meetchat.space/madame_bovary_2014_castm6sgi.pdfIn PDF document text
    • https://cdn.sqhk.co/lofesaxudiwo/jEIjeje/dolltoon_cartoon_creator.pdfIn PDF document text
    • https://cdn.sqhk.co/dojatejij/JkhbWZb/snake_in_toilet.pdfIn PDF document text
    • http://gewututikame.getenjoyment.net/faure_les_berceaux.pdfIn PDF document text
    • https://femutawinitogim.weebly.com/uploads/1/3/5/4/135401040/makoliximirija.pdfIn PDF document text
    • http://barbanapoli.moscow/288967232035cruw.pdfIn PDF document text
    • https://nigupuwifiva.weebly.com/uploads/1/3/5/3/135329906/e77c1ec0c76.pdfIn PDF document text
    • https://cdn.sqhk.co/zomulusiku/ifpkvhb/kemaxidinegaboke.pdfIn PDF document text
    • https://mamafaxugelat.weebly.com/uploads/1/3/0/8/130813750/soterawof-jopapata-fiwok-mefoxuliki.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/nuzinexisoj.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/fedijomo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bumejefivoxigo.myartsonline.com/wrath_of_the_righteous_best_class.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d51c8dd1-fa23-4566-87f4-c762cdd19cef/best_compact_sound_system_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/532bb997-ae72-4f5f-88b3-afac8b8e750b/anker_keyboard_ipad_pairing.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61E 5448 bytes
SHA-256: 41bb296e4cb01daf38899b66516c9b7ee0cb709612e925baae17e7fbb4d7d966
font_01_sfnt_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 9824 bytes
SHA-256: 9d5bbd38090c6ede2f05f337ac7cc0882f777337e2a8ebea0bfe4cf20f3fc716
font_02_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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