Malicious PDF — malware analysis report

Static analysis result for SHA-256 b461c54294ad3043…

MALICIOUS

PDF

75.4 KB Created: 2021-03-28 18:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb89bbd51b2043dfb6ce61b3c4cea689 SHA-1: f03272c26226a8b5e32b8586653ce330cdb41b41 SHA-256: b461c54294ad30437b72fec146e7456b856ab743724c0d575b57b75135636211
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of a large number of external links, suggesting a malicious intent to redirect users. The document body, though heavily obfuscated, contains references to product names and application details, which could be part of a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=keurig+2.0+k200+plus+series+water+filter
    • http://wowitaly.pro/76023207708p3pk.pdf
    • https://cdn.sqhk.co/rosivapixove/hiehccB/fakomumugowigafu.pdf
    • http://mysteps.online/par_quoi_peut_on_remplacer_le_beurre_de_cacahutesrkpk.pdf
    • http://silkhfig.bid/have_a_relaxing_weekend_quoteszkjqa.pdf
    • https://cdn.sqhk.co/fimirexuf/jgPjgAu/hallmark_tv_series_2019.pdf
    • https://cdn.sqhk.co/ganidabizi/j7Lgjgi/kick_the_buddy_forever_hack.pdf
    • http://mon-fortuneo.best/pico_island_beachesh92ax.pdf
    • https://cdn.sqhk.co/nogorodizet/b91zjgf/ringtone_apple_iphone_6_download.pdf
    • http://kyrgyztours.com/80134469333v7rgr.pdf
    • https://rujetedokut.weebly.com/uploads/1/3/4/5/134504429/fefana-jokuv-tomoxibafofi.pdf
    • https://cdn.sqhk.co/teforoke/9hhjYjf/pencilmation_game_free_download.pdf
    • http://voicebftyi.com/what_is_the_ontological_argument_for_gods_existence3aieg.pdf
    • https://xivapumi.weebly.com/uploads/1/3/1/6/131606059/sipaxojodapa-pewoji.pdf
    • http://leoidet.xyz/customer_service_representative_job_description_exampleswzfnl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://43466d02-873c-4564-b63c-f2f79aa6d38e.filesusr.com/ugd/fd64e8_e03273cab2a945beaa9fac22fef7203d.pdf?index=true
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_2dfb44bc39e0460ca41cde8e06f199bf.pdf?index=true
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_b41180a0eda74c34a84e33973269a9d6.pdf?index=true
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_18065272c4114fb194d4fafb688287a4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e692.bin
c32874d84ebc670c9f5155763881c8a9cc4722deff9760a85fe825d1c1dfb10e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 5500 bytes
font_01_sfnt_off0000f97c.bin
60f643d78652fb10e6cca54d8d3aa9cc75bebcb6dfb138a927cee3609885e4af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 11464 bytes

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