Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a393503dd2de26…

MALICIOUS

PDF

77.8 KB Created: 2021-03-25 10:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 117ec270b3432e97407ea522fc223976 SHA-1: e036a275cb05141c6162fb9605a963fcb954b8da SHA-256: 69a393503dd2de26e301934692b4dca8c83ff5cc1013a6803d015acd9e91946e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/123?utm_term=duds+crossword+answer
    • https://cdn.sqhk.co/wetaxawirewu/e2AA0lw/champions_hockey_league_wins.pdf
    • https://cdn-cms.f-static.net/uploads/4477162/normal_601551a29eb7a.pdf
    • https://cdn-cms.f-static.net/uploads/4369164/normal_604160e5331a9.pdf
    • https://static.s123-cdn-static.com/uploads/4371523/normal_5febd75f9be52.pdf
    • http://masuxolujetub.22web.org/flowchart_template_office.pdf
    • https://cdn.sqhk.co/jabosuve/Igdhfa3/lg_xboom_go_pl_review.pdf
    • https://cdn.sqhk.co/zurefaxenov/8Scjcgd/car_crash_simulator_game_online.pdf
    • https://cdn.sqhk.co/gobuwovuv/uhc5pCH/11218844501.pdf
    • https://cdn.sqhk.co/kekelivig/vOhhgiN/70983942208.pdf
    • https://cdn.sqhk.co/goberirud/hdljd8f/sign_off_gmail_account_in_iphone.pdf
    • https://cdn.sqhk.co/nobutowug/euugcjj/blue_heeler_size_by_age.pdf
    • http://tunulawofu.iblogger.org/crossfit_training_guide_nutrition.pdf
    • https://cdn-cms.f-static.net/uploads/4505096/normal_5fe8462ca8a3a.pdf
    • https://cdn.sqhk.co/sozaxejiv/gd0qzhf/automotive_color_shift_pigment_powder.pdf
    • https://cdn.sqhk.co/gadujotev/Jhihfjj/samsung_family_hub_french_door_refrigerator.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_99fc8b40a5e24514867c6e5637d83a07.pdf?index=true
    • http://mafojupovovod.rf.gd/chrome_browser_pc_32_bit.pdf
    • https://s3.amazonaws.com/jesidofefe/anonytun_achi_apk_free.pdf
    • https://s3.amazonaws.com/limepusotanal/kogabesekizinamexalawusow.pdf
    • http://rumajajoneder.rf.gd/16401431211.pdf
    • https://6dd05bf8-a32e-4ce7-8057-9a1894012cff.filesusr.com/ugd/4ce960_1a8e04e992d143e3ad46712b3c42ea3c.pdf?index=true
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_ecd330d43e1542a29bbeefaf3c874dba.pdf?index=true
    • http://lofuwokapowudug.rf.gd/the_ugly_duckling_original_story.pdf
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_7040392f15e8415198f5616006152433.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f495.bin
cea124b9218db2b906d64d1ee32cd40bba86375483f86503915aa3b36a7c44cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 4992 bytes
font_01_sfnt_off000105b4.bin
7c5e7bd61e10eea7124d7126af2b04586a3fee2f67e299f0dc5e980fbfd2fe40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 10584 bytes

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