Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e184686d1305797…

MALICIOUS

PDF

76.2 KB Created: 2021-01-12 14:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a9d2a445532a97cce788a84f832691d0 SHA-1: 51068e89783bd791e28320cc0af17ab89e2c1212 SHA-256: 4e184686d1305797b0d2fa2dc45ba31282f00f9fe6fd7676cd7bdba9257ee142
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains a reference to 'war movies 2019 tamil dubbed', likely a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://gettraff.ru/aws?utm_term=war+movies+2019+tamil+dubbed In PDF document text
    • https://cdn.sqhk.co/bimepefav/cNggfva/exoplanets_3d_lite_stroller.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/dwifAzs/average_velocity_formula_calculus_integral.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/mokaxirogimu-manisufedoko-gagitolela.pdfIn PDF document text
    • https://cdn.sqhk.co/xibumediw/SG3ge8R/degimolonagidoxapu.pdfIn PDF document text
    • https://kiwosadil.weebly.com/uploads/1/3/5/3/135384828/vugunek.pdfIn PDF document text
    • https://pesodubebugi.weebly.com/uploads/1/3/4/2/134234841/1969036.pdfIn PDF document text
    • https://site-1168003.mozfiles.com/files/1168003/messenger_latest_version_apk_uptodown.pdfIn PDF document text
    • https://burekanokem.weebly.com/uploads/1/3/1/0/131069897/gikogepoziwope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f8d391a4d36e.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/igjjhix/hill_climb_racing_2_cheats_pc.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
    • https://s3.amazonaws.com/tuxenipup/barrow_island_weather_report.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_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 5444 bytes
SHA-256: 1a384bc6a9077caad1ce416904c65142eac0e5d5f3b43e53e111d09d7d2062a9
font_01_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 11180 bytes
SHA-256: 6a2d3e519d903e57a25a1cbc9e796b433350fb436ec47233e3b62d0e7401bcda
font_02_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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