Malicious PDF — malware analysis report

Static analysis result for SHA-256 391ffbe709a1dac4…

MALICIOUS

PDF

74.5 KB Created: 2021-04-22 17:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 927071b9e8ec77ec3bc6f90564e2e66a SHA-1: 272db479010e27ca3293c6707c095e8c785b4942 SHA-256: 391ffbe709a1dac4901b6f80c890306f15f54ea17ad41eebe3f9a0ff9076bcb4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, including one that redirects to a URL containing a query parameter related to detecting lies, suggesting a social engineering lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the phishing or malware distribution nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://druttle.ru/strik?utm_term=how+to+tell+if+someone+is+lying+microexpressions PDF link annotation
    • https://cdn.sqhk.co/walamalesumi/dZCIpcS/webuzozikuvolijebesudibuw.pdfIn PDF document text
    • http://wordsideget.top/fulgor_milano_range_manualilrg9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_60004f27d5e3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480749/normal_605ddc886c856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_603c70f15621c.pdfIn PDF document text
    • http://hopecommunitynaz.com/what_is_the_role_of_public_relations_in_international_marketingsxe76.pdfIn PDF document text
    • http://wegolurubakisud.22web.org/53522369085.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499995/normal_60010560546e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388060/normal_5fcb14ac698b8.pdfIn PDF document text
    • https://cdn.sqhk.co/pegipoveridi/Gmnjg8L/wolf_hunter_cowboys.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c31730-ad7f-4f2a-9d20-96f008c8f75b/plantronics_headset_cs510_mic_not_working.pdfIn PDF document text
    • http://detapir.rf.gd/sentencing_council_guidelines_drugs.pdfIn PDF document text
    • http://ribigilubawedom.rf.gd/mamezabi.pdfIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_335ae43de24447c4ae601cb18faa735c.pdf?index=trueIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_244bb42590ff442d8a8893c1f1f634b3.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_ac1ebe41cc58468ab47ce3be4d923163.pdf?index=trueIn PDF document text
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_6ef96db7fdd941a5be50f4596564b218.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c45ab31-e2ba-410b-9d4a-a5ef3aec988b/the_battle_of_the_labyrinth_chapter_9_summary.pdfIn PDF document text
    • http://gabazozota.epizy.com/54649892428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd8dc19f-ee94-4201-ad9a-b63aadb6240b/6202772216.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_off0000e745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 5348 bytes
SHA-256: 158afc5f948c8a28c8fd28928632b3f5b19ed6f1fd8511d9202791e8f45356ab
font_01_sfnt_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 10232 bytes
SHA-256: 6167c0aa1394d9c0c25f63d1c233d2088f68f81fb14596e9ba1bdd6051198173

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