Malicious PDF — malware analysis report

Static analysis result for SHA-256 451bf086be8b9087…

MALICIOUS

PDF

69.7 KB Created: 2020-11-26 02:14:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 638baf44df697a2ed2b06c127ef60dcb SHA-1: b40e7c4d5cb0308c7824f28e8b81030f3a5bf89d SHA-256: 451bf086be8b90870656a4c7cf430c73e34f6aa4b9fbb0d81b3a1ff0b3926d72
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary malicious URL identified is 'https://traffine.ru/strik?utm_term=do+you+report+equal+variances+assumed+or+not+assumed', which is likely part of a link farm or phishing campaign. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', further supporting its malicious nature. No scripts were extracted, but the structure suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/strik?utm_term=do+you+report+equal+variances+assumed+or+not+assumed PDF link annotation
    • https://nubagusajol.weebly.com/uploads/1/3/4/2/134235051/197cd45465462d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_5fb50f8244d20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f9243224393e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5f99d3633e428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408589/normal_5fa4586214b10.pdfIn PDF document text
    • https://bitexaxa.weebly.com/uploads/1/3/4/4/134477172/vixipob_fuviz_keleziv.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/solonebosop/60829302797.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/conveyor_and_elevator_belt_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/map_of_medieval_europe_1300.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/administracion_de_recursos_humanos_snell.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/nopivulod.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/new_home_sewing_machine_manual_532.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/revarudemujajinojajo.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_off0000d0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AE 5504 bytes
SHA-256: c96f7090217561e1c0795d13f86db4a1f5db2f8c88b778c6c7201a512a463620
font_01_sfnt_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 11292 bytes
SHA-256: cf33e012dc799af0fc2dcd1f3f042bb34834120b4cd1840c39aea35d860d2a03

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