Malicious PDF — malware analysis report

Static analysis result for SHA-256 797fb4edad5b0c7c…

MALICIOUS

PDF

79.6 KB Created: 2021-02-15 12:17:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0006d540980c96a671e466cab6e8d90f SHA-1: 42c52b76f46e73c6b615c4d3d061cc333be8719e SHA-256: 797fb4edad5b0c7ce716fb787641e95243b73b1a8bfe153a9ab455226c54df40
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to air conditioner reviews, directing users to external sites.

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://jacksth.ru/wb?keyword=is%20mrcool%20a%20good%20air%20conditioner PDF link annotation
    • http://lighterusb24.site/95376707038ctguf.pdfIn PDF document text
    • https://kagepumesafoke.weebly.com/uploads/1/3/4/8/134846889/1048155.pdfIn PDF document text
    • http://leyloften.online/57819147330rd3gs.pdfIn PDF document text
    • http://help-bluebadgecenter.com/selecta_ice_cream_triple_chocolatezxyv3.pdfIn PDF document text
    • https://mobuverafawez.weebly.com/uploads/1/3/5/3/135346795/8849715.pdfIn PDF document text
    • http://eduha.online/baal_veer_3gp_video_djking._com4qcvx.pdfIn PDF document text
    • http://fridgeservice.ru/772857168789mxqp.pdfIn PDF document text
    • https://xovonanukotu.weebly.com/uploads/1/3/4/8/134898985/9327237.pdfIn PDF document text
    • http://rewita.fun/beauty_and_the_beast_piano_sheetiyyv6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402486/normal_5fdd995581257.pdfIn PDF document text
    • http://alisabor.design/cute_snapchat_logo_white1te2d.pdfIn PDF document text
    • http://supportcopyright.net/fusedoxuwewusodig714z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454684/normal_5ffa44b0420de.pdfIn PDF document text
    • http://golden-bridge.pro/ansible_2._8_documentationstv9k.pdfIn PDF document text
    • http://copyrightmediahelp.com/dakixukuxifabi4hmba.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/vatus.pdfIn PDF document text
    • https://bilokomomaxin.weebly.com/uploads/1/3/5/3/135397692/5691105.pdfIn PDF document text
    • http://lunesygets.xyz/kasusjs8cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 5196 bytes
SHA-256: bc059b41ce5740653177e883fb1e8a8553aa69edd4b3bdfa84b0447769498f39
font_01_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 10720 bytes
SHA-256: 9ae16958585634c1c0edbd8cbdf1aad516c594a4098a5f0b32ebb9f21a4ace61

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