Malicious PDF — malware analysis report

Static analysis result for SHA-256 9314807c6e30bf06…

MALICIOUS

PDF

74.5 KB Created: 2021-03-13 23:22:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: eaf24f4bfde280de1d33d34211b4c217 SHA-1: e68f019acefc455d8041529433b755d3bcc53ab9 SHA-256: 9314807c6e30bf060eea796c016dcadcbba7441ee60f597b996c1337336158ad
134 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a potential invoice lure. It contains multiple external URIs, including one pointing to zajinet.ru, which likely serves as a distribution point for further malicious content. The presence of embedded URLs and the overall structure suggest an attempt to trick users into downloading or accessing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/wix?keyword=track+and+field+score+sheet PDF link annotation
    • http://keruluzo.medianewsonline.com/free_converter_to_word_software_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480876/normal_6010566cab8ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452217/normal_6015d3ee2d659.pdfIn PDF document text
    • https://cdn.sqhk.co/segidexu/hbihIhg/sawetowezoforelinufera.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/why_my_acer_tablet_wont_turn_on.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/jjeJEwr/1516173273.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471719/normal_5fefdddf22fb6.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/14972584401.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413374/normal_5ff4eac6514c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377128/normal_603d0ab7c76f9.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/building_the_intentional_university.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447649/normal_5fdc89c639541.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/uygh42w/99048941994.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kefodek/acrimony_full_movie_putlockers.pdfIn PDF document text
    • http://jobifizokugo.rf.gd/5950327591.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/ascendant_2017_free.pdfIn PDF document text
    • http://dozonexupiwef.epizy.com/36689443371.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/symptoms_of_malaria_parasite.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/munchkin_board_game_tips.pdfIn 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_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 5120 bytes
SHA-256: 14b7b3990d9cb30b044e2e248bf08a94c35667bdad80cef082ee8e4c5394d1c5
font_01_sfnt_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 11164 bytes
SHA-256: 30cbb012c98c0ad68c4bc9b91905fd4e2313447588342dd5fcd4aa1ff6c1efc0

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