Malicious PDF — malware analysis report

Static analysis result for SHA-256 7740ac38f7753fc4…

MALICIOUS

PDF

85.4 KB Created: 2021-05-30 18:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0aacfa7683c82d64ee1b9569d26f41f2 SHA-1: 7172c38c054b9291dd29c2f1333afe1133069b0c SHA-256: 7740ac38f7753fc4c29c13032c81d1b8d6e24d712f419f2e508d2e6c90f59b15
186 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 0.9991

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://dugedepap.ru/strik?utm_term=how+to+beat+a+confidential+informant PDF link annotation
    • https://namonizumus.weebly.com/uploads/1/3/4/3/134345036/4155709.pdfIn PDF document text
    • https://notesorujul.weebly.com/uploads/1/3/1/4/131407176/dowadizuwuwovex_niximosukez.pdfIn PDF document text
    • https://xikunamoveg.weebly.com/uploads/1/3/4/5/134596382/6b8e10696ccb.pdfIn PDF document text
    • https://sebaderibegagib.weebly.com/uploads/1/3/4/5/134583030/zofilud.pdfIn PDF document text
    • https://suwanozafedo.weebly.com/uploads/1/3/4/5/134587456/mibukapuzekuwez-sipukifiza-bigumafixi-zituledona.pdfIn PDF document text
    • https://takewozijofu.weebly.com/uploads/1/3/2/6/132682119/xitisunuf.pdfIn PDF document text
    • https://rakomuditopag.weebly.com/uploads/1/3/4/7/134717505/tujenirepisebokori.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/4c9e4e42.pdfIn PDF document text
    • https://vozumovoso.weebly.com/uploads/1/3/4/5/134506012/178b8fe547b58.pdfIn PDF document text
    • https://tugagofinose.weebly.com/uploads/1/3/0/8/130874012/punove_xafubovi.pdfIn PDF document text
    • https://nowefatitabawev.weebly.com/uploads/1/3/2/7/132740181/3e1506de0515c7f.pdfIn PDF document text
    • https://foworagajiwodim.weebly.com/uploads/1/3/0/9/130969946/volof.pdfIn PDF document text
    • https://pagowabelada.weebly.com/uploads/1/3/0/8/130874520/5147570.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/ec198cd5-04b8-461d-8745-e17375cf93ee/how_to_make_a_flow_map_geography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29cb9a7c-1210-4252-8847-ef24080b4ece/hp_photosmart_7515_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2bd8a54-1766-478c-9fa0-4a8e843ab259/lifopibusetetizuzugesazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf828fb-2167-4460-bedd-08ce22496677/gramatica_de_la_lengua_espaola_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ddb3165-7c36-4579-aaa8-161ae4069a70/33742482913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3744ed3e-f50c-4f6b-8994-ac37b7fff9f5/how_to_read_annual_report_like_warren_buffett.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71d7a74e-4cae-4471-a638-75692d65c7cc/best_fl_studio_tutorial_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbfaece6-3466-4538-9259-5f5ab569a571/18638913878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ec646c-26a9-4a40-9524-01effd2ab659/fumamujajes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d3c959-bf5a-4f00-9dd5-cc0002dae572/61855184397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd52d5e0-7219-4860-a31c-c4b3dcd88663/feberatel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9535e65-058e-4373-a091-bcce26e99fa3/how_long_do_you_go_to_jail_for_possession_of_a_stolen_firearm.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_off00010f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 5180 bytes
SHA-256: 499fcf95d048a8982a255a6c059fdfd7316d5723a8026772445ded8d93d911e4
font_01_sfnt_off000120b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B2 11448 bytes
SHA-256: e174b026191cbed3ae5a36c62a57a7e4006409c6d2ab1d703be1e5793032eda8