Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77362a571433afd…

MALICIOUS

PDF

75.9 KB Created: 2021-04-03 11:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 074a84282ccbadfba83f668d68831fa0 SHA-1: 72a6d584a0ea027b71ab56ecda68de000177c49f SHA-256: d77362a571433afdfd23c5f8a81751a94c1e7c3192ef6531b280778d488eb2ae
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://lozipotod.ru/wix?keyword=swix+base+edge+file+guide PDF link annotation
    • https://cdn.sqhk.co/foxoxaze/icY3Pij/81829560708.pdfIn PDF document text
    • http://nasty666.space/rawls_social_contract_theory_summaryxsaku.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/cjhBidK/fawabitikipoburebilugiko.pdfIn PDF document text
    • https://cdn.sqhk.co/pomodizad/hhn9ogg/dota_2_beginner_guide_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/retakabif/jagjjc6/8386514336.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/Y8ijdjd/best_free_spider_solitaire_app_without_ads.pdfIn PDF document text
    • https://cdn.sqhk.co/fekesolip/jgi5ij3/kerimakadazaxomumolaturu.pdfIn PDF document text
    • https://cdn.sqhk.co/zeputefilu/hc9uvEd/warlord_tft_comp_10._21.pdfIn PDF document text
    • http://trastqort.online/fuwulilapitebirutipazatgegxl.pdfIn PDF document text
    • https://cdn.sqhk.co/xewiliwilax/Jhbhage/hip_hop_music_dance_meaning.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/bihar_b._ed_syllabus_2020.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/57341478021.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_f667bcad5c1c43cfb7bb0f9d035cd549.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_1941fa5aff9b4bf6ae08efa4bd75e223.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_3d11b76af74241009789af15d0015369.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_985f86c74368478a8b1c9e659d24d691.pdf?index=trueIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_d7b54ab950c4480294df38e8af7fcdd3.pdf?index=trueIn PDF document text
    • https://cabae152-0d18-4cc7-9545-8711a89e332e.filesusr.com/ugd/607e04_d9a081a79e114f0c99804eae86e21e77.pdf?index=trueIn PDF document text
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_dad2a485c50c4fa2aea1910d05b45352.pdf?index=trueIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_440263571ac64b57b2fe1fca5afd6a39.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F2 5380 bytes
SHA-256: 9db5ac8a65eab2893460e4fae1163572624c5d0521bbfdde3a2bd96327d130c1
font_01_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 14204 bytes
SHA-256: 290a34aabe2db447454a7634ebe22daa1b9bec21ecfc8eeec8c9d6498467c8b2

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