Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f56ded3c6a829f4…

MALICIOUS

PDF

76.8 KB Created: 2021-03-23 08:19:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9586ec88d6a86863fef70ec42b0a993 SHA-1: b00bef888a42e2b7aca495235ce6fce09e9ef94e SHA-256: 7f56ded3c6a829f499dc24dbba6287eecd7dee1c1bf1a01e8c4541839132e875
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://zajinet.ru/wix?keyword=forced+assimilation+apush', is suspicious and likely part of a malicious SEO or phishing campaign. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=forced+assimilation+apush
    • https://cdn.sqhk.co/reretukida/hcP23N0/rudedetiriwowexo.pdf
    • http://xarapover.mygamesonline.org/vivibejodamelujif.pdf
    • https://cdn.sqhk.co/jisofoxabap/Wihibja/alight_motion_pro_apk_2._6.pdf
    • https://static.s123-cdn-static.com/uploads/4419626/normal_5fdf49558288c.pdf
    • http://denizan.com/fstoppers_instagram_hashtag_guide7qtp7.pdf
    • http://tonevagewalilu.medianewsonline.com/does_big_buddy_heater_have_a_fan.pdf
    • https://cdn.sqhk.co/bobimugura/ib8hihi/57485678647.pdf
    • http://miiliioner.xyz/kitchenaid_refrigerator_repair_san_diegoqyi2q.pdf
    • http://organic100.fun/the_courage_to_be_disliked_free_ebooknaw8o.pdf
    • https://static.s123-cdn-static.com/uploads/4387589/normal_5fc9bee53e4a8.pdf
    • https://cdn-cms.f-static.net/uploads/4481154/normal_6054b67e2463d.pdf
    • http://tipijijajofupi.sportsontheweb.net/10311171540.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7ccfe4ae-80ac-4d4d-acc9-ead2d28e7ec1/janimikikivexiris.pdf
    • https://uploads.strikinglycdn.com/files/1285bc06-410c-4297-bdd6-aa523e19534f/how_to_unlock_oven_door_on_maytag_gemini.pdf
    • https://uploads.strikinglycdn.com/files/3af1db89-6318-4056-b99f-c5facd1770da/53217002238.pdf
    • https://uploads.strikinglycdn.com/files/8f4b9b93-7d40-40d1-9485-6892c820941a/adt_key_fob_battery.pdf
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_a2eddb6054914ce786faaa4c539724f6.pdf?index=true
    • http://koradanizepagow.myartsonline.com/45921060625.pdf
    • https://uploads.strikinglycdn.com/files/c9c9355d-62a8-4e4e-9de1-259580130672/dell_ax510_sound_bar_installation.pdf
    • http://bavotuvezomevi.myartsonline.com/accuracy_and_precision_worksheet.pdf
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_439707deede04a75b9eca95b335606a9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e005.bin
f6446cc6d4ccad98882a60cd1d8fa185e9ef08767ad246095733638402fe8a2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 5152 bytes
font_01_sfnt_off0000f14e.bin
69258be1cbd888c689771b492fd3e6ef51b56dcbcee86aec35f6a35deed2fcb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 10760 bytes
font_02_sfnt_off000115e1.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E1 4324 bytes

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