Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a37fc3f9ea1e98…

MALICIOUS

PDF

74.9 KB Created: 2021-04-06 12:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 657dc570ed0642490861b4c2ebeeb4e4 SHA-1: 0d45472a3fa8f66b4ce7700df2d0402819a7cad5 SHA-256: 34a37fc3f9ea1e98cee91ff6bd44203909e098f2d52b79b5444951eb1ff26689
186 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as a link farm, containing a large number of external URIs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

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
  • 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.
  • 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://baarspo.ru/aws?utm_term=is+maggiano%2527s+open PDF link annotation
    • https://cdn.sqhk.co/savageven/haid0Lb/bike_race_king_game_video.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/9Ylggj7/yamaha_snowmobile_desktop_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/ihcbift/sumedeluful.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/igjdg6W/bang_bang_movie_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/zugeketinog/4WXpppS/plague_inc_board_game_achievements.pdfIn PDF document text
    • https://cdn.sqhk.co/waxusuxagaki/ieEihk0/what_you_appreciate_about_someone.pdfIn PDF document text
    • https://cdn.sqhk.co/zelagagunogo/vicTagP/yes_that_dress_mod_apk_download.pdfIn PDF document text
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/jatiw_sakusuz.pdfIn PDF document text
    • https://taferirufip.weebly.com/uploads/1/3/4/5/134582969/344eb62d.pdfIn PDF document text
    • https://fitabidik.weebly.com/uploads/1/3/0/7/130776693/bosilukegeti-tedepegizuxajus.pdfIn PDF document text
    • https://cdn.sqhk.co/numobelez/eRjddNn/android_accelerometer_example_app.pdfIn PDF document text
    • https://cdn.sqhk.co/kotoweraga/iJiiyig/amazing_android_apps_not_on_play_store.pdfIn PDF document text
    • https://cdn.sqhk.co/zijatiki/hb9ihUH/weforimesepuzurexuteli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_1fdb21c99530407a955db3c8d2e9ef9a.pdf?index=trueIn PDF document text
    • http://mejefelutirarej.epizy.com/gangplank_galleon_sheet_music_flute.pdfIn PDF document text
    • http://rukukuwozar.epizy.com/cbx_200_strada_manual.pdfIn PDF document text
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_7ade41aaba37454db11f40d3c57ff2f1.pdf?index=trueIn PDF document text
    • http://vikudet.epizy.com/dobiv.pdfIn PDF document text
    • http://warepeg.rf.gd/87028891445.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_e995f5ebcc8540ef9e88b67ecfa4e69d.pdf?index=trueIn 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_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 4984 bytes
SHA-256: 4c1b953b68a3fe16d0787b4e65e96f755f78218f123c66363fa1dcef1940154b
font_01_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 11432 bytes
SHA-256: 857e0d4033cef5881837cd6ddc0d273bf21b88f6c3605869234638ca42c93242