Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9565e30ad530b57…

MALICIOUS

PDF

74.9 KB Created: 2021-03-19 11:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2da8daff19bc9f717286f5e927ed052 SHA-1: 732644bc8508f223b3e7229e2178dfee32b9a0b3 SHA-256: f9565e30ad530b57e1f3912ea0c534ac3eb13712812639445b58dde4efd6cfde
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely leading to phishing sites or malware downloads. The embedded URLs, such as 'https://dafemum.ru/123?utm_term=android+sqlite+database+crud+example', reinforce this by pointing to potentially malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://dafemum.ru/123?utm_term=android+sqlite+database+crud+example
    • http://detonic-romania.website/473940128620awqo.pdf
    • http://lngcliente.com/joseph_prince_sermons_freeu7mtf.pdf
    • http://fruitnaturs.space/java_jdk_7_kompletan_prirunik_downloadj64jz.pdf
    • http://trokot-tonirovka.online/casio_aq-s800w-1evdf_erkek_kol_saatiwfxok.pdf
    • http://drovazvenigorod.ru/descriptive_and_limiting_adjectives_worksheet_with_answers3pa5o.pdf
    • http://it50discount.pro/256937446782ykhh.pdf
    • http://bestunew.xyz/damepeyd4a1.pdf
    • http://7gusevshop.space/formula_car_racing_2020_mod_apkzd702.pdf
    • https://cdn.sqhk.co/gujowaxexag/jjWKhd6/pimexoteju.pdf
    • http://pagebake.com/bodyguard_song_teri_merict1ta.pdf
    • http://noksipals.online/how_much_does_it_cost_to_rent_a_carpet_cleanerj3uji.pdf
    • https://cdn.sqhk.co/pidagasew/bihVhfR/nose_piercing_parlor_near_me.pdf
    • http://naturwow.space/gojixidajkmvvu.pdf
    • http://razvivatel.blog/diana_death_news_reportrpnnb.pdf
    • http://like-store.site/93491317940j67ug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2cb96c42-5e04-4c74-a2e8-745a35b56156/93412914756.pdf
    • https://s3.amazonaws.com/dujepav/92035254407.pdf
    • https://uploads.strikinglycdn.com/files/07899643-9b64-45b4-97f4-fc274fb179a7/what_are_some_puerto_rican_sayings.pdf
    • https://uploads.strikinglycdn.com/files/2e38e964-b1d7-4bdd-a91a-ff8358ee40ff/77135684638.pdf
    • https://s3.amazonaws.com/divelatoxa/vebuv.pdf
    • https://uploads.strikinglycdn.com/files/9c066883-dcfe-40cd-8545-ec474957b0ba/sovapufan.pdf
    • https://s3.amazonaws.com/nuselufuzo/jatubat.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_off0000e40d.bin
3fbcb9acf0db89b6eece5d694c154ae509811f319b858faf9470cff87498e728		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 5540 bytes
font_01_sfnt_off0000f6ce.bin
8644296991871b8cf914b3935cee1c2843f320745b0c1ebe50dfefb6296856e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 11660 bytes

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