Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9543a90ee7f0b5…

MALICIOUS

PDF

87.0 KB Created: 2021-03-15 05:09:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 314d32312c76a55d5c77cd908d3ddfe8 SHA-1: 50d7d5a8c5e4a845dd9d048afc7890677ca87587 SHA-256: bc9543a90ee7f0b5da45e96cc41713f65fcb8be4fd262af5d49c3d1bbaf49423
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/123?utm_term=sonic+all+star+racing+transformed+android+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417122/normal_5fcf65f7f2a18.pdfIn PDF document text
    • http://manybigs.space/795147006886xind.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410988/normal_5fe35d822b169.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/hihjfQ8/marxism_in_american_academia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402706/normal_5fe16efb465b4.pdfIn PDF document text
    • http://nokilibetajew.mywebcommunity.org/77614828119.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420764/normal_5ff9de061eab9.pdfIn PDF document text
    • http://wedasuf.getenjoyment.net/three_questions_by_leo_tolstoy_summary_in_hindi.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/dixusumi.pdfIn PDF document text
    • https://cdn.sqhk.co/rudugebakivo/jejegcy/dwight_yoakam_wife_photos.pdfIn PDF document text
    • http://bonifacy.site/fujewavedidujolaxxs763.pdfIn PDF document text
    • http://front-glass.space/63061460591pami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_6014d168da07b.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/jihi9hd/offroad_kings_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444875/normal_6028e762410a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/04b09ee6-76cc-4d4a-8b2d-bc5032500552/bagabapetubamonep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64fa44d4-af28-48d8-9ed0-ce79f8fcc651/how_to_master_cooking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e9b7b73-79e7-4b70-9902-d3d94364c501/51922106293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d4694d-fa81-4a2d-b9b5-04b140681964/84317949465.pdfIn PDF document text
    • http://gidubabe.myartsonline.com/sweetheart_bodice_pattern.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/48828059945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/528bfa41-ce48-434d-b05a-4c36e1307a63/the_innovators_dilemma_clayton.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 5428 bytes
SHA-256: 6bba52d60e641b42f4395dd86810a7c6f128aa0b90ae64d3f2ca118f669f31cf
font_01_sfnt_off00010367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 11260 bytes
SHA-256: d15ebc488be4a8ed0d934e48ac344099cc958b90931ec6f64cb9d62c3401db79
font_02_sfnt_off000128b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B4 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off00013de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2