Malicious PDF — malware analysis report

Static analysis result for SHA-256 993ec5917cc4f132…

MALICIOUS

PDF

83.6 KB Created: 2021-03-24 11:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc2f92fe12e741ec32ff915d9b284633 SHA-1: a780360b6fff556dc92ca99e93ebbdb3bb58e870 SHA-256: 993ec5917cc4f132ee377a312fa3f36f7f263cec8d5929041d27e867f10a304b
126 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including one to 'xezojetit.ru', suggesting it is used to redirect users to potentially harmful websites. The document body, though heavily obfuscated, appears to be a lure related to 'Top 10 android apps', which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/123?utm_term=top+10+android+apps+september+2018
    • http://lebizifijafaxim.medianewsonline.com/speed_queen_tr7_vs_tr5.pdf
    • http://blog-millionaire.buzz/sijoxokojupiliwaxabah6im.pdf
    • http://formulamoney.top/how_to_redeem_a_minecraft_code_on_xbox_one4qdg3.pdf
    • http://smotrikino.fun/462648872215jtbu.pdf
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/lazabukodudado-kobozakom-turilevex.pdf
    • http://tugokutuli.scienceontheweb.net/bond_duration_and_convexity.pdf
    • http://apkweb.net/facetune_apk_premium_ioscun3s.pdf
    • http://lazategomid.scienceontheweb.net/bilingualism_articles.pdf
    • http://kadaxejob.mypressonline.com/african_american_inventors_book.pdf
    • http://zoguponuwuxoli.medianewsonline.com/95490396154.pdf
    • https://pawunotapi.weebly.com/uploads/1/3/1/4/131408062/suguneda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lipabarud.atwebpages.com/should_i_buy_a_refurbished_ipad_mini.pdf
    • https://uploads.strikinglycdn.com/files/e4e80942-6044-4a91-87c8-f0b75602f631/hp_officejet_6500_no_scan_options.pdf
    • http://bifovigavij.myartsonline.com/setujimupusox.pdf
    • https://uploads.strikinglycdn.com/files/4bda65e6-2ccb-43eb-92e7-db59a4d9e351/vofifaxutuwefemufebima.pdf
    • https://62619d47-812b-4c4f-a232-aa08d86264e8.filesusr.com/ugd/6d62c1_25c55739f76845e493131f5a6c62321d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e2e44bf0-a8b2-4d9d-be4b-fefe3b8a23c9/ikea_flat_pack_sofa_uk.pdf
    • https://uploads.strikinglycdn.com/files/28369cef-953b-4af1-9c99-8ca05141fdb5/59352784525.pdf
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_a16bc68e0a5045aa879b33e44ef67bf0.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_off0000fa7d.bin
43981e7fd2150a109f4c2ebeea18bd2c3f8d1d8012f4bcba030548d9fb23f92e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 5468 bytes
font_01_sfnt_off00010ce8.bin
3eca62ed81357fd7c60b8fc8efb073dacd5f11bcf28f04793d91a238b1819084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 10672 bytes
font_02_sfnt_off00013149.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13149 4324 bytes

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