Malicious PDF — malware analysis report

Static analysis result for SHA-256 71899cf4817e9b96…

MALICIOUS

PDF

75.7 KB Created: 2021-04-17 22:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 59f31ce2c8e6d09f41fb9d1de379aa23 SHA-1: 8fc7b161a406f00eefb86bec539bd4dcdffa33cc SHA-256: 71899cf4817e9b96c46f8cfb790cb4bf3dfa027aead51d7a59670d7f2d246bda
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=volume+price+analysis+pdf+free+download PDF link annotation
    • http://helpforteam.com/toshiba_remote_ct-90302_user_manualvhu0l.pdfIn PDF document text
    • http://semasinizitowo.medianewsonline.com/vimixotilezu.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/zatugudaxaji/otP8fmp/bittorrent_for_pc_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/junuxuseg/ijhdia7/vujinekomoworisiweruw.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/bhi4VZd/blockman_go_hack_download_android.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/ujhkKp7/17042421338.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/vighcGV/the_penguin_historical_atlas_of_ancient_egypt.pdfIn PDF document text
    • http://joriwolujuf.sportsontheweb.net/anticoagulant_vs_antiplatelet.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/hgrP2LX/the_new_york_times_crossword_app.pdfIn PDF document text
    • http://gulibej.22web.org/bathukamma_audio_songs_telugu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rafodize.rf.gd/pusovamapata.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_9e75760cccb74a2f945b2ab776dca7a4.pdf?index=trueIn PDF document text
    • http://rijogutigoxek.epizy.com/wuxorefenipuvudelimegep.pdfIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_c741f5afd3e64acb88d59b3584a3fe8c.pdf?index=trueIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_5d3acad78593424292ad90250982e4ec.pdf?index=trueIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_f1050d6c2c3e4270ada102c1ca418058.pdf?index=trueIn PDF document text
    • http://bejelopelavisi.epizy.com/71226668180.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_fbddca546b6943f5bab765a30f0de85a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 5460 bytes
SHA-256: d9c4b60e005b72b2fcf1067df36b121d6f2fb5fb2f3ccd2b397ddccef0fe278f
font_01_sfnt_off0000f1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 10828 bytes
SHA-256: c800d8c1479651c0e84a604879bd869e411942cde53ffc2b7b65564312f7bdfb

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