Malicious PDF — malware analysis report

Static analysis result for SHA-256 623274c23d6f7d83…

MALICIOUS

PDF

78.1 KB Created: 2021-03-30 03:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e426e1a1b36025262b29a5b11eacb959 SHA-1: 59446d0aafada07c5f53f562631f616aa534575e SHA-256: 623274c23d6f7d8347a75da562ba712eb7cc51425c10f5cc0210fdaf303bbb44
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely serves as a phishing or trojan delivery mechanism. The presence of numerous external links, including one pointing to 'xezojetit.ru', suggests an attempt to redirect users to malicious sites or download further payloads. The document's content, though obfuscated, references 'Beckmann rearrangement pdf download', likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/award?keyword=beckmann+rearrangement+pdf+download
    • https://cdn.sqhk.co/narobalof/jhaYcgf/28995957176.pdf
    • https://cdn.sqhk.co/jenireni/lxTmtic/97913760121.pdf
    • https://cdn.sqhk.co/narulaloro/PjdA4ib/ice_age_village_cheat_codes_for_android.pdf
    • https://cdn.sqhk.co/lafuwexale/RjhDhfN/14957583738.pdf
    • https://cdn.sqhk.co/desiruzag/5MWykjh/referencias_formato_apa_6ta_edicion.pdf
    • https://cdn.sqhk.co/naxaroja/2jf1Qt1/asana_mobile_application.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_3ef0b82ce33f4515a6adab4e7d15c475.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a74e89fb-8188-4ab1-92e8-bba8ebae7d02/how_to_do_a_final_house_inspection.pdf
    • https://uploads.strikinglycdn.com/files/001309e4-407c-405b-8b0a-0e100f8a7158/dodemejifatolazifij.pdf
    • https://uploads.strikinglycdn.com/files/9386b6b4-c3e1-4f43-876b-2dedc959a9dd/insinkerator_badger_500_leaking_from_top.pdf
    • https://uploads.strikinglycdn.com/files/c5507de3-a8c3-4f5f-bc68-1f26dab1adaa/rules_for_knights_templar.pdf
    • https://uploads.strikinglycdn.com/files/bb568eb1-ebab-4eb4-9b52-a0f4ce0a0bf8/9209227501.pdf
    • https://uploads.strikinglycdn.com/files/7b3ebbfd-69c5-477d-a14e-0bc36fde0d45/el_poder_de_la_oracion_persistente.pdf
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_f7afcdceb43c4e2aaf9efc0bf763f142.pdf?index=true
    • https://uploads.strikinglycdn.com/files/78055128-1b52-4c71-8ab7-45d83245e0a8/31661484227.pdf
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_29ae0266ee8a49d98ec829ee19b303f2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b5eff787-123b-4b7e-9250-256413f2a15d/empire_warriors_tower_defense_td_strategy_games_hack.pdf
    • https://uploads.strikinglycdn.com/files/0fce8e09-3303-4bb1-8978-22b3d00c6825/how_to_prepare_a_hot_dog_bun.pdf
    • https://a3abd3d7-f7e4-4b0c-86b7-ec358d8c805a.filesusr.com/ugd/97a3b3_c1b17a6039cf437b869bd48603913267.pdf?index=true
    • https://uploads.strikinglycdn.com/files/66fa4a9f-92d3-49da-a65f-9897dc9da503/how_to_operate_keurig_k_compact.pdf
    • https://uploads.strikinglycdn.com/files/eda32d70-93c2-480c-8b41-a384238bbe42/63805255008.pdf
    • https://uploads.strikinglycdn.com/files/ab0bdbeb-e7a1-4f2c-840f-82c7ac36a470/maytag_gemini_double_oven_bake_element_not_working.pdf
    • https://uploads.strikinglycdn.com/files/90bbbaf4-68fd-45df-bd3c-a0f7d0de87c0/vofobesino.pdf
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_037d17163f014a908d714d14b0e7eeb4.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_off0000f1e3.bin
9bb231ff76db4d53857421cf2220dc8e5550fd0dbd4c2a112d1dd02f32a5f552
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 5500 bytes
font_01_sfnt_off0001049d.bin
334d2a1cc95a62bf50789919d2311ffbcbcd08426837f1b7f2dd1c6cc659713a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 11448 bytes