Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11fba2886d4953a…

MALICIOUS

PDF

86.4 KB Created: 2021-04-16 11:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: da4fa6c5ad9b8fec39c7705e53c53b2c SHA-1: 4d10599afaf0ae5c2866f894a18b50044e3a0a32 SHA-256: d11fba2886d4953a930638fadb3e971f264feecef1fc510774d8dfeb3f2be43c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect the user to potentially harmful content.

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://leonvi.ru/strik?utm_term=a6500+vs+a6600+autofocus PDF link annotation
    • https://cdn.sqhk.co/jekefebiba/N2JbAgf/boniralipomab.pdfIn PDF document text
    • https://cdn.sqhk.co/gitesafuwu/geijphe/lepevikitibudukuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/bebiwamulanu/gifjcid/63359930678.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/bjhieig/sivikefopuv.pdfIn PDF document text
    • https://zubenori.weebly.com/uploads/1/3/5/3/135394140/suwil.pdfIn PDF document text
    • http://bubble1.space/tenitupv8sr.pdfIn PDF document text
    • https://jenifamizoj.weebly.com/uploads/1/3/5/3/135319667/9057727.pdfIn PDF document text
    • http://familyit.info/does_medicaid_cover_vision_in_michiganv0ytf.pdfIn PDF document text
    • http://buledumemo.iblogger.org/mosigowazol.pdfIn PDF document text
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/8206144.pdfIn PDF document text
    • http://raisinsapp.pro/nordictrack_a2105_motor44ecx.pdfIn PDF document text
    • http://wwbook.org/mamedikzpg3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/what_are_the_4_stages_of_economic_development.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/tefigumipugonovexu.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/dragon_age_origins_gameplay_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/nufizamefijowatumirep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e843be-8a55-406b-866e-5dc090c4e492/gosukamamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4fad986-c30c-4f86-8765-a236d694bea4/white_christmas_ornaments.pdfIn PDF document text
    • http://budobilososuw.rf.gd/52590989551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b05ebbaf-e0aa-49da-99a3-93057b95f2c3/kidde_hardwire_smoke_detector_with_9v_battery_backup_6-pack.pdfIn PDF document text
    • http://vojemigami.rf.gd/campylobacter_species.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5449aaf2-3236-4499-8797-99b874e72578/do_wirehaired_dachshunds_shed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92b4ea3b-023e-4e0d-8f8c-19e4501d3f9a/vamogipebekal.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_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 5216 bytes
SHA-256: 9fe690dfcc0bea967b268f80fb1f89b37c67825196215b76619276635ab3ca96
font_01_sfnt_off00012613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12613 11284 bytes
SHA-256: 74afdcedd1c4bbf1bbcfa34763f6930ec76df1f125f47d71ea2d32ad3da137b3

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