Malicious PDF — malware analysis report

Static analysis result for SHA-256 737313d8fa8ed940…

MALICIOUS

PDF

81.8 KB Created: 2021-05-03 00:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3a7eb6fdb51a2b169d6f85b99edbc36 SHA-1: c3ab8d38d48a8b2679a76655ddf531f20712c577 SHA-256: 737313d8fa8ed940b3dff204ed52e1ce77f0da55c3f6a06f642bc919b4249d29
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating a large number of external links. One of these links, 'https://maypoin.ru/strik?utm_term=how+many+calories+in+sonic+small+mozzarella+sticks', is flagged as unknown reputation and is likely malicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/strik?utm_term=how+many+calories+in+sonic+small+mozzarella+sticks
    • https://cdn-cms.f-static.net/uploads/4403414/normal_605d7b408bbfa.pdf
    • http://ferategaj.scienceontheweb.net/water_pollution_project_for_college_in_bengali_language.pdf
    • http://zavulibalox.mypressonline.com/53556280731.pdf
    • https://cdn-cms.f-static.net/uploads/4412887/normal_6035700865d13.pdf
    • http://dududuw.mypressonline.com/how_to_draw_out_a_splinter_with_epsom_salt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_ffb79c073c024d1db8b22baeab12b70e.pdf?index=true
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_963fa16f86f140ff828404c3b1c5963a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dbe8d225-35eb-46bd-8b3c-0e416618410c/casio_se_s700_manual.pdf
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_0b2644ae996345518c9ea6f7ea2dc437.pdf?index=true
    • https://uploads.strikinglycdn.com/files/21aaa8ed-b827-4201-9fb5-a29d7fc32ad9/48232354493.pdf
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_cd29ba7d2507487c8a6b78787678c4ea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/686bd060-1d95-41e5-8a3f-4f0ac8dda0ee/59262301486.pdf
    • https://uploads.strikinglycdn.com/files/f82270e8-4086-4c0e-a18b-8bdb7d667a87/nurutizekamimi.pdf
    • https://uploads.strikinglycdn.com/files/6a523269-84f0-44e3-a5eb-d72051f1216d/73735124530.pdf
    • https://uploads.strikinglycdn.com/files/d74882bb-386a-446f-9b58-de3678f630b5/personajes_del_libro_los_hermanos_karamazov.pdf
    • https://uploads.strikinglycdn.com/files/24d5dd60-eee5-48fb-b48c-2df8244f035c/kenmore_convection_oven_wont_heat_up.pdf
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_f010b38c4f764e3a999a446b9742fd9b.pdf?index=true
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_8714c2e0029c4b64bc9baedbf3c76587.pdf?index=true
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_e6f6b499d0b546edb0f298adec1989f7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/87a8ef3f-bb46-45a5-9222-8b0e5dfe2acb/diary_of_a_wimpy_kid_the_meltdown_yumpu.pdf
    • https://uploads.strikinglycdn.com/files/311a80a7-9dc5-467e-b881-57911e85c560/motivational_interviewing_education_intervention_for_nurses.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe9c.bin
59f0550bafb34756bd9eb94316f1940347891da4a6b0629315ec2abed397b0fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 5216 bytes
font_01_sfnt_off00011059.bin
5888208b27342721d71a1a1aec89c638bc6519a2594430122a08d7f0300e25ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 12096 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.