Malicious PDF — malware analysis report

Static analysis result for SHA-256 d783e1af98232007…

MALICIOUS

PDF

78.7 KB Created: 2021-03-30 12:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2339184793dfbffc4f39ccbdcc4c9b8c SHA-1: 979b32885a108a8572e29aaab64d961b75e9f03a SHA-256: d783e1af98232007e810ab4e92c1874c999841d36084b6cc23b6a66fb8a1d515
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/strik?utm_term=braun+9390cc+vs+9290cc PDF link annotation
    • https://lokejefu.weebly.com/uploads/1/3/5/3/135301848/502134.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamujigip/hi5ea5D/8137615187.pdfIn PDF document text
    • https://cdn.sqhk.co/tidelefuzin/KNTggdE/basic_interview_questions_for_civil_engineering.pdfIn PDF document text
    • https://lilususuki.weebly.com/uploads/1/3/4/3/134317990/ranisekosabid.pdfIn PDF document text
    • https://suvuleje.weebly.com/uploads/1/3/4/8/134871599/pezodu.pdfIn PDF document text
    • https://kojivijagidisu.weebly.com/uploads/1/3/4/0/134042347/9876276.pdfIn PDF document text
    • https://nixuxani.weebly.com/uploads/1/3/4/4/134433038/2433092.pdfIn PDF document text
    • https://cdn.sqhk.co/ragebobeb/jIgifFa/poppy_kart_2.pdfIn PDF document text
    • http://paximosikelos.22web.org/bassinet_fitted_sheet_adairs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_1c768ea5cc7b417585041590538c9012.pdf?index=trueIn PDF document text
    • http://nakepusigazu.epizy.com/37573623916.pdfIn PDF document text
    • http://xawepimoj.epizy.com/54661496300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f842fece-9f48-476b-ae45-7d24ebcbbc5b/tumodujigalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e8bbab-e95f-436e-945c-8f1ae3b6d17b/xepafaxibidipetokig.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_0e58042086e848cf8a6facf64d4a6da9.pdf?index=trueIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_a3511ed4395946658e7cd1cf6417eaf2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/62045d85-5fa9-4aa9-a607-4880346d63d2/how_to_draw_electrical_symbols.pdfIn PDF document text
    • http://xerozodofuvu.epizy.com/66557247078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc912c36-72c5-49b8-bbde-ff7f70c1d899/ratufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbfda16c-44e5-4644-96d3-e00aeb5c0330/24909071219.pdfIn PDF document text
    • http://pakewerulawe.rf.gd/29073599797.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_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 5464 bytes
SHA-256: 9579dc5a91ba41e280aec0c1ae41decbcd002745927293acf3ea1143b349d526
font_01_sfnt_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 16048 bytes
SHA-256: e68310512704b01f0e11103cb03a533495ead4ffa89eeeaf6bd16cf8eba1bf50

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