Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc750cde62780e86…

MALICIOUS

PDF

91.7 KB Created: 2021-04-02 08:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11662cea9215bbbca364b9d36571b39d SHA-1: 9ca54171b8de01cdbf11a28130b20591ea0c75cc SHA-256: bc750cde62780e86f1c3ecd57c070c66e9d84946c723722ce0ee381754136a85
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing campaigns, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://golowaki.ru/123?utm_term=business+card+illustrator+template+free
    • https://cdn.sqhk.co/bofilewidil/nigjigg/virus_protection_free_for_iphone.pdf
    • https://cdn.sqhk.co/fefowofuk/LZjcifB/best_drought_proof_grass.pdf
    • https://dujolisinapujis.weebly.com/uploads/1/3/4/3/134328324/e5bf9daa.pdf
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/9059650.pdf
    • http://zakosemej.mypressonline.com/fapanis.pdf
    • http://usesalon.xyz/myles_munroe_books_maximizing_your_potentialvxlee.pdf
    • http://tvoeobrazovanie.fun/173689187673fn1e.pdf
    • http://pc-remont.website/does_saunders_help_with_nclexmclt5.pdf
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/panagizubuzugizovide.pdf
    • http://itclick.info/how_to_do_mental_multiplication_fastb0tpp.pdf
    • http://shlifovka-pol.website/stephen_kings_it_drama_miniseries_casttpdb9.pdf
    • http://timurberg.ru/21008055656ae7w7.pdf
    • http://hookup158.fun/infringements_act_20067bu0v.pdf
    • https://cdn.sqhk.co/patagarinixa/BjbjjW9/megomibuded.pdf
    • http://reweder.site/how_to_get_tivo_lifetime_subscription_for_free7ktcl.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • https://cdn.sqhk.co/desogepupema/hfiaoeg/zombie_apocalypse_gun_store.pdf
    • https://nakidero.weebly.com/uploads/1/3/4/5/134524904/477fe10c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_e5ecd20548eb486991e91a37cd539aa9.pdf?index=true
    • https://aa0e52d0-3c12-4d86-bfd3-e3284f950a51.filesusr.com/ugd/eb1974_1b31e96fc258497580bb922af2cb7d64.pdf?index=true
    • http://nivuzujanux.myartsonline.com/22151819192.pdf
    • http://gamelaluwer.myartsonline.com/biology_practical_class_11_cbse.pdf
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_a96210473a5f4a0388fdef506d723dad.pdf?index=true
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_11cf884251464412b3e8fd69ee1f72e6.pdf?index=true
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_a355a25f77ce4600a490036acdd4c38a.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_off000118ff.bin
bdfff6f0519f8784ca59cfff56cb0e0083a6ed82b784b23061c4e2377d2eb950		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118FF 5232 bytes
font_01_sfnt_off00012aa2.bin
4ca455a0571bf96964da7ad97c76256076241984ba8c914b1f31dc5d8e5e234e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA2 11728 bytes
font_02_sfnt_off0001528d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1528D 4324 bytes

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