Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42d1a7952c73ab5…

MALICIOUS

PDF

160.7 KB Created: 2021-03-01 10:02:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a7c7f8f297eba8f5734395ea91f3ce9e SHA-1: 5ed0747d2a084708c5e2f19f59f360e17a8b3580 SHA-256: b42d1a7952c73ab52c5d00cc0d695f91d0ff2ae928dd446c223a6104bd74fb25
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting and link farms, indicating a likely attempt to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to 'Magna carta' and 'language', potentially to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://vilenefex.ru/aws?utm_term=magna+carta+written+in+what+language PDF link annotation
    • https://pukaxonimuno.weebly.com/uploads/1/3/4/4/134435323/vojebokuzorixif-datoridilowediw-zepinegagogali.pdfIn PDF document text
    • https://sagerogokijisoj.weebly.com/uploads/1/3/4/6/134601402/kidunimafudo_noliledex.pdfIn PDF document text
    • http://likujamozajowu.22web.org/camera_translator_apk_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_6027a179060ae.pdfIn PDF document text
    • https://zuwanefo.weebly.com/uploads/1/3/4/0/134040462/1171845.pdfIn PDF document text
    • http://dobomasinuraz.iblogger.org/alzheimer_s_test_camel_answer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_60174e5bf3585.pdfIn PDF document text
    • https://cdn.sqhk.co/nolovojawek/ghkvjgu/real_drift_car_racing_game_download.pdfIn PDF document text
    • http://sidikapefujuxe.22web.org/cpm_cc_algebra_2_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_60334b962f86c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451753/normal_601924e7298cd.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/Rshchdo/business_international_network.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/PhcHuja/72092308923.pdfIn PDF document text
    • https://lolorude.weebly.com/uploads/1/3/0/7/130775760/zixelasokimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409113/normal_5fe6a2f056d6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bodegifu.atwebpages.com/litajidoj.pdfIn PDF document text
    • http://zumewozuzetarun.epizy.com/bare_knuckle_brawler_english_subtitles.pdfIn PDF document text
    • http://lisiguzaxupego.epizy.com/60722221880.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23B27 4980 bytes
SHA-256: 5f028d66946d87de224503c2f53501ce495b28a19b949553e24b30792efabaeb
font_01_sfnt_off00024c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C33 12660 bytes
SHA-256: 463dfbe0c906c7ae643fbc931d521e5b344a3d9a355e4196fe3b0d155a6c0d35

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