Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4ff2093381e87b…

MALICIOUS

PDF

84.9 KB Created: 2021-03-30 22:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c6b2b67faac572b434a1009cce507abc SHA-1: c420f7bd92c891b78000dcb0e3970ce9ee25ff34 SHA-256: 8d4ff2093381e87bcbae2a4667a007a1bfa8825168e968f02540aaec63d1fce7
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files hosted on various disposable domains, a technique often used for SEO manipulation or to distribute malicious content. The presence of a link to a known malicious redirector and ClamAV detection further supports its malicious nature. While no scripts were extracted, the structure and embedded URLs strongly suggest a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=the+doll+2016 In PDF document text
    • https://savatevadenu.weebly.com/uploads/1/3/1/4/131452836/bofudelexij.pdfIn PDF document text
    • https://fibobamoga.weebly.com/uploads/1/3/1/6/131607866/vuferoxuxolefugofeg.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/X6Fhgjf/gym_exercises_for_beginners_male.pdfIn PDF document text
    • https://jabefebilinoke.weebly.com/uploads/1/3/0/7/130739415/8155b1aa20c.pdfIn PDF document text
    • https://xomarexisu.weebly.com/uploads/1/3/4/7/134701616/welaf-lilaleguninixot-besubatofozalil-tawefewunaru.pdfIn PDF document text
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/9011901.pdfIn PDF document text
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/2861794.pdfIn PDF document text
    • https://kubegagalinono.weebly.com/uploads/1/3/4/7/134714436/pizoxodaxub.pdfIn PDF document text
    • https://cdn.sqhk.co/pivoledofag/eQzNgdC/vivug.pdfIn PDF document text
    • https://guvijubeb.weebly.com/uploads/1/3/5/3/135318684/gadikadatadebefi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4001d983-0a4e-4c5f-8a1d-2e3594af3dcf/fujitsu_halcyon_flash_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27cf5ee6-49c4-4582-8dd5-7a6c09d92692/visisixogaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb390662-2ac8-4d55-b70a-400a41552ce3/97550678126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c83dffa-e8f2-4ff1-86ac-c995561babb3/grammaire_progressive_francais_avance_corriges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56862090-416f-4f41-b1d2-f7b7f4f3fd04/15895896210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c0d972-bc78-44ca-aa5e-366982755aa8/matricom_g-box_q2_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a78004a-0d1d-4776-9ab7-123fde7728e6/august_wilson_monologue_competition_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ac0011-e595-4bce-a375-cbd306f62c8a/cisco_rv325_firmware_1.5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9c79b7-29c9-43e8-8795-25fd7175a260/43730899901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f23418-6031-4d80-a52e-a3e26bf6b6c2/fukigugote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32859aec-5874-4de2-b5fe-ffd021a7c7c1/steven_bragg_books.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 4412 bytes
SHA-256: 735cb6a1b766cf1903f2ddcb54ed27b909bcdc62ca015f8870b0d23fba25e8be
font_01_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 10196 bytes
SHA-256: ada24abfb30d33785e474edf9e207df9962fea3aee61b8144718fd6879fc7627
font_02_sfnt_off00012308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12308 16192 bytes
SHA-256: b80dcff4b26782ff2bd1ed82e01ce9053ba91b1a5afb9bea673378648d26bec5
font_03_sfnt_off00013818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13818 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333