Malicious PDF — malware analysis report

Static analysis result for SHA-256 a342ab8ed68a7216…

MALICIOUS

PDF

76.8 KB Created: 2021-03-08 15:57:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 39821f1d05e6f386a5ae235c554960d0 SHA-1: bb6419aaee67d3642cff07ac84c51ad7ed0a703c SHA-256: a342ab8ed68a7216c928356dce841dce1faef5c8375bc9226526584a8ec789f7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL, 'https://gimoguvi.ru/strik?utm_term=150+ml+de+harina+a+gramos', identified as a potential malicious redirect. The document body is heavily obfuscated, but the presence of external URIs and link farm heuristics suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=150+ml+de+harina+a+gramos PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407331/normal_60075beeb8720.pdfIn PDF document text
    • http://nakozek.mypressonline.com/52026936398.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/nCAihVa/9964374395.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiren/PfgfMnH/pixies_band_poster.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/bifiijh/kukemajalumiwilubapumase.pdfIn PDF document text
    • https://cdn.sqhk.co/manizamo/mibsdGg/relaxing_spa_music_with_water.pdfIn PDF document text
    • https://cdn.sqhk.co/pibutuvopedu/mRXQBia/52160628484.pdfIn PDF document text
    • http://mklhhhh.space/narujh3hw4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_603c057d458d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385424/normal_5fd2235309d9e.pdfIn PDF document text
    • http://hook-up.fun/jopukiferasogupumaaodvh.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/fezevasuzakubexi.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/alQkgjf/harvest_hosts_locations_in_oregon.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/17677300626idio3.pdfIn PDF document text
    • https://cdn.sqhk.co/fularulojoze/6shfmgi/sw_tor_sounds.pdfIn PDF document text
    • https://cdn.sqhk.co/lenawemijixe/0hfPJji/nefoni.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/ghdhf2u/free_ringtones_app_for_iphone_xs_max.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/evaluation_sheet_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/add_bookmarks_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/jusav.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/mivida_master_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/wow_farming_mounts_guide.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_off0000e496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE496 5464 bytes
SHA-256: 6708d4121332b03fc51e7fae39e27f0b67fc4e2e88533e68b31079080a7a1807
font_01_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 15648 bytes
SHA-256: f6b34e3a81899a480056006d4328a1588fb182d7cdb4a1935cb45a6c34ea52b4

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