Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db020b3af364f57…

MALICIOUS

PDF

81.3 KB Created: 2021-04-25 02:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78749a2466ef0168efcf4a118c68c45f SHA-1: 69218aa584d1db0ca13993f80da003c00f412629 SHA-256: 9db020b3af364f57f69ee353cd52481934c89305a2045035a2364485c2a7fe33
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or lead to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection further supports its malicious nature. The embedded URLs suggest an attempt to redirect users to phishing or malware distribution sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=pe+exam+preparation+course+california
    • https://cdn.sqhk.co/vijasezadida/hfLjfPw/free_background_music_for_videos_soundcloud.pdf
    • https://cdn.sqhk.co/xobakidanav/ieihY4X/naxobefepu.pdf
    • https://cdn.sqhk.co/gitaligido/chaiJig/17860667768.pdf
    • https://cdn.sqhk.co/motuvitewodi/cmhcibr/9288611473.pdf
    • https://cdn.sqhk.co/kutajanode/hdp9Zca/blackpink_piano_game_apk.pdf
    • https://cdn.sqhk.co/pesunexaxak/aAjikhg/undisclosed_piece_of_information_crossword_clue.pdf
    • https://cdn.sqhk.co/bilanogakiw/AGyjbJ6/84310032270.pdf
    • https://cdn.sqhk.co/nawiwola/lhe1Khh/popular_black_boy_hairstyles.pdf
    • https://cdn.sqhk.co/zopizote/uMDjhjc/suvukumibefok.pdf
    • https://cdn.sqhk.co/zotofoza/qzhbYxq/cnc_machine_metal_cutting_price.pdf
    • https://cdn.sqhk.co/bilanogakiw/dRswI2Z/lunchable_nintendo_switch_scanner.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dujepav/45331732509.pdf
    • https://s3.amazonaws.com/zosevid/romeo_and_juliet_movie_free_download_mp4.pdf
    • https://s3.amazonaws.com/busutafitufe/13245442442.pdf
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_6397c75dbccc42b8af0f0efa3ba33183.pdf?index=true
    • https://s3.amazonaws.com/gewisetug/51465563315.pdf
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_c0aa3db6a518435ebae6fdbd1eaf44c2.pdf?index=true
    • https://s3.amazonaws.com/siwixomudit/jotobakitizetilemedoj.pdf
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_d2854b0e03bb40ae824134486b3e8808.pdf?index=true
    • https://s3.amazonaws.com/sowirutelevolur/blogspot_apps_free.pdf
    • https://s3.amazonaws.com/najubu/matlab_plot_line_style_dashed.pdf
    • https://s3.amazonaws.com/lovomijelun/bachelor_of_science_in_information_technology_management.pdf
    • 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_off0000fdc4.bin
de88d186c90e01a5426efbbdb1d9707d87c8a61765e1b9f9468743db29f92436		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 5228 bytes
font_01_sfnt_off00010f79.bin
cc16f087e8cc3335f9da2bd5029d6dc17d2e8def682dfe2dad79d63d46433cc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F79 11752 bytes

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