Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5527d4c968957a…

MALICIOUS

PDF

83.9 KB Created: 2021-05-21 06:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cba5835c596ecb522e56d17dee1bffca SHA-1: 52155ac14dbb9d868eb46acbb58aa75a36b0d495 SHA-256: 3d5527d4c968957a88f1d35316f01379e63708f78860a53fa2db74d9a54f558b
156 Risk Score

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 0.9994

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 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.
  • 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://mezovuduw.ru/strik?utm_term=how+to+explain+bad+grades+to+parents PDF link annotation
    • https://fitovaturi.weebly.com/uploads/1/3/4/3/134371738/4876874.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/9536805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502245/normal_601b2c1a804e3.pdfIn PDF document text
    • https://jivupofa.weebly.com/uploads/1/3/1/4/131406879/287452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461495/normal_6037ff5ec8310.pdfIn PDF document text
    • https://gudetopop.weebly.com/uploads/1/3/0/9/130969639/7fae042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_6057a3813a6b4.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/8e6e4b35-6667-4335-8be3-98dbaa7480cf/jenisivomexam.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/63007037595.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/how_to_use_a_ti-83_plus_calculator_for_algebra.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/4_disciplines_of_execution_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/6303030739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ec76f18-9b2a-46b4-a4eb-7df8ecb5a1c6/50129767259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2048649f-813e-499f-b16c-26dc77bbf9ac/53980633736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81dacaa8-2ff1-48f6-9ff1-ca8f06ad2303/fan_tastic_vent_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f033f67-6181-416c-a08c-d1e892ed35c3/why_is_my_dyson_pulsating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ea04f8d-d969-4385-ad39-8d8a9b16f024/how_to_setup_scan_to_computer_on_hp_officejet_4630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83833a55-1837-43a7-bb67-b4d371c7dd8c/matthew_5_niv_bible_study_tools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac906667-55a5-4c40-b857-787618a1c96c/8469081670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b07a1bd6-d8e1-409c-950a-cc6c2607f928/me_before_you_ost_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a575fdfe-1559-41fe-aacb-34b2b11109f0/best_resistance_bands_for_womens_arms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b32c5008-e7f3-4ff5-a524-bb0c31e681d7/biromerogelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0bcf80a-5d9e-44bf-b4fe-4ad2978ccc3d/aprender_ingles_escuchando_musica_subtitulada.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_off00010b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1B 5388 bytes
SHA-256: 176e3dd57b7a432e411453d8ce0a27addb2b44ad3fe73971525a55085f10c0b1
font_01_sfnt_off00011d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D86 10700 bytes
SHA-256: 8d93215a4818fc2c38174209eb1800bb84f5fd4183d98ff40c24281e1c3e8784