Malicious PDF — malware analysis report

Static analysis result for SHA-256 55affd448b835825…

MALICIOUS

PDF

77.4 KB Created: 2021-05-29 21:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: da7422799a77ed4b3d691403d767d29a SHA-1: e64891c27e06a06f304b43f625b4e5c31355fb59 SHA-256: 55affd448b83582584276696c1c18118f2deefc7c714876ef36ad7dd443034c5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or scam campaign designed to redirect users to malicious sites.

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://mezovuduw.ru/123?utm_term=excel+advanced+filter+copy+to+multiple+sheets PDF link annotation
    • https://rajulotopeza.weebly.com/uploads/1/3/4/6/134665566/3359105.pdfIn PDF document text
    • https://tetagusupawuwag.weebly.com/uploads/1/3/4/5/134586179/lafipowekakebegekebe.pdfIn PDF document text
    • https://koredude.weebly.com/uploads/1/3/1/4/131406285/geroxupekix_mebazale_ruzavumekelunif.pdfIn PDF document text
    • https://zoparidozuxeb.weebly.com/uploads/1/3/5/3/135390671/9f9ba.pdfIn PDF document text
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/e516bed.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/fezes.pdfIn PDF document text
    • https://zedowami.weebly.com/uploads/1/3/1/6/131637063/7620497.pdfIn PDF document text
    • https://menekagamop.weebly.com/uploads/1/3/4/0/134097565/e2cff.pdfIn PDF document text
    • https://fimupekegu.weebly.com/uploads/1/3/4/5/134502303/4638860.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/1918772.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/22c8c0ca-554e-40dc-8dd5-09b4995a0b87/98894500472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df094db4-33d5-4487-b4d2-99f506819f3a/49315494561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6ca079c-1db0-4bb2-8c18-4056adf37698/hp_photosmart_7520_printer_ink.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94da9e6b-e60b-4c87-9508-bd107a90ffdc/minister_of_justice_and_correctional_services_south_africa_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fbedda5-5e69-4bc3-a8a1-b57ee98208c5/does_trx_training_build_muscle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74312999-af81-4080-835d-79c58112fda3/rental_receipt_format_india_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/467cffa5-c3e4-4fcd-a21e-c67800b32e89/69871774332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bfdbfbf-817a-4b56-8c5a-08692eefe381/mivawisododevupum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ecb953-afc3-40ae-ae53-49e62b1fb845/16208045916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28509424-876a-4e76-b54a-fe0cb651bb30/70737811758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b8f4e42-3517-40dc-b52e-d01b5b2580d3/zuronopakafuxegez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dff266d-04d4-45a9-a705-32361e96eb38/what_is_a_rabbit_hole_called.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a1c9d7-24be-4190-b81f-bd4a79986480/kawasaki_bayou_250_tire_size_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13303973-ec57-45dc-b5fa-1e483960c2f4/77958582035.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_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 5580 bytes
SHA-256: 2e2bd074a64870457a489359c4a958a5618a18498e6fb3ba0c19d223547f441e
font_01_sfnt_off00010288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 10860 bytes
SHA-256: 0fd90c0bc1afe05a7f884d2519ea4e6b3f932041703149f974f1c3f2deb8b2d6

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