Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b00cab187ccbbd…

MALICIOUS

PDF

77.2 KB Created: 2021-05-01 16:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ed92b9b663f6e93c6d54200f15c3108 SHA-1: 7fd260d120790c31e7efab5ff7a824cf4ad23bfb SHA-256: 89b00cab187ccbbd37bc82797d839feb534f14ef8ee7f5f2cfea9275dc8f3a6c
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URIs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=dyson+big+ball+canister+vacuum+accessories
    • http://fimewot.xyz/no_grain_no_pain_diet_reviewstev2t.pdf
    • https://cdn.sqhk.co/fukonovum/hhZhcme/magic_snake_toy.pdf
    • http://copyrightram.net/osmosis_jones_movie_answers0lrrg.pdf
    • http://tuwedoviwe.iblogger.org/new_opportunities_beginner_student_s_book_free.pdf
    • http://216tilford.com/i_play_tennis_in_japanese43gpn.pdf
    • https://cdn.sqhk.co/womilepeba/bUhaOif/simple_past_negative_forms.pdf
    • http://bisujidaruxu.iblogger.org/72376123896.pdf
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/bilaxojivimomo-zuwodoxojedodus-jejowepunefofi.pdf
    • http://sallehub.xyz/celal_ile_ceren_tek_para3eby3.pdf
    • http://mabay.fun/ririnirozoovfg.pdf
    • http://hocostyle.ru/eureka_whirlwind_bagless_canister_cleaner_nen110a_lightweightudf1c.pdf
    • https://cdn.sqhk.co/xonafelog/3jc3jb2/vuxuruxedez.pdf
    • https://dosukasexu.weebly.com/uploads/1/3/1/6/131637789/vonipuvixiko.pdf
    • http://microbladingcertificationdfw.org/newoxorebiraxovurldkv3.pdf
    • http://bit7.top/toro_recycler_22_190cc_troubleshootinghxm9h.pdf
    • http://kukebeg.22web.org/24458461970.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d5a0b2cc-8ced-4dac-a60b-1cefd9f2929d/80555815783.pdf
    • https://uploads.strikinglycdn.com/files/7a17109c-686d-4e4c-a397-2f88551afb52/data_analytics_for_beginners_amazon-kinesis-data-analytics-java-examples.pdf
    • https://uploads.strikinglycdn.com/files/1077e184-7e67-4ca4-8a01-9052d54513c5/sgx_nifty_live_candlestick_chart.pdf
    • http://sokevigaku.rf.gd/all_new_tiktok_song.pdf
    • http://jevigoxiferoka.epizy.com/teragesenofujunibepuzi.pdf
    • https://uploads.strikinglycdn.com/files/02ee95f3-a1c9-4abe-9328-b5be858d4ac5/glass_sword_movie_theater_west_plains_missouri.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_off0000f235.bin
a50597b7b8d79c7459e659aefd7536fdcc58a093f8051d832c9f3c4acc27c80d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 5420 bytes
font_01_sfnt_off000104aa.bin
462556cb4c4e66722751b990e6021512b63aa6dee2541fb7cd5ee05d50c3960f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 10196 bytes

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