Malicious PDF — malware analysis report

Static analysis result for SHA-256 5776a8fb60e361cd…

MALICIOUS

PDF

67.8 KB Created: 2020-11-16 18:51:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e1d4f18263c999ef7bc8c753a8e21d0d SHA-1: d67051aaf47da1d949ad00471f419a6e2f44000e SHA-256: 5776a8fb60e361cd539bf34140f50481dbdc7c614f97da08e3d2a604039cdb02
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://traffnew.ru/123?utm_term=iscas+2020+registration PDF link annotation
    • https://zororoxuz.weebly.com/uploads/1/3/4/3/134309160/wirejuwewurewi.pdfIn PDF document text
    • https://zixatemanareku.weebly.com/uploads/1/3/4/4/134472678/sewezosunitutefafaga.pdfIn PDF document text
    • https://viwosexoteb.weebly.com/uploads/1/3/4/6/134631328/wufixumuxojup.pdfIn PDF document text
    • https://wotapidedodibi.weebly.com/uploads/1/3/4/4/134475573/276b90.pdfIn PDF document text
    • https://kozezivu.weebly.com/uploads/1/3/4/4/134444222/dipaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5f972982726a0.pdfIn PDF document text
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/vemadarusojemelukoga.pdfIn PDF document text
    • https://zokagigapo.weebly.com/uploads/1/3/4/7/134719336/05de7018435d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_5f90fa2a78767.pdfIn PDF document text
    • https://wajajudamivigo.weebly.com/uploads/1/3/4/3/134359543/gigeko.pdfIn PDF document text
    • https://farigelud.weebly.com/uploads/1/3/4/2/134266281/moxakefafo.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/bazarerin-surilugajexu-jusibut-jopaxig.pdfIn PDF document text
    • https://zibeselev.weebly.com/uploads/1/3/4/1/134131471/mabazuturej_xafurupitar.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/3384496f-1d46-41e9-9d7b-028930ffb114/16472457709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c1d9f2-cb70-4937-aeb7-5d3963a0a56b/gojedexutigexizabufojigim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ea2412d-fa15-4cce-858c-007592c8ad7a/soneto_clxvi_tema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cf24160-877a-4a41-8324-6c499439b6e0/45445974626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4417d9-37fc-40d4-a6b9-30fd59ae5a05/groove_ring_sizing.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_off0000cdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC6 5144 bytes
SHA-256: 3e7e284a02aa4af0ba7c7e95f2777441e3d2ae598a8a00965119c0fa7c20bd10
font_01_sfnt_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 10320 bytes
SHA-256: ea126b640de4184637b7030c418a6612ca83f65e1384944c8d8b3ea0f28541d2

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