Malicious PDF — malware analysis report

Static analysis result for SHA-256 a465761335c82071…

MALICIOUS

PDF

111.6 KB Created: 2021-03-10 08:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f7a83265d89fe0e99ef5fc57a347298 SHA-1: 55cd66bd4c72c729859129378e4e5b6678355268 SHA-256: a465761335c82071c734056f69706c756fbc66af15e303ff3d132f40899d7dc7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains associated with link farms and SEO manipulation, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=capsulitis+adhesiva+pdf+scielo
    • https://static.s123-cdn-static.com/uploads/4366973/normal_5fc779fdf1303.pdf
    • http://botifosumefe.22web.org/novur.pdf
    • https://static.s123-cdn-static.com/uploads/4470408/normal_5fcda55316970.pdf
    • http://jujekokegolalut.iblogger.org/7484689163.pdf
    • http://bivisurat.22web.org/tidefunagonoju.pdf
    • https://cdn-cms.f-static.net/uploads/4504641/normal_5fe86918e29ec.pdf
    • https://static.s123-cdn-static.com/uploads/4379477/normal_5fde68e06357c.pdf
    • https://cdn-cms.f-static.net/uploads/4481162/normal_6046dbd2f3625.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zoxumatodemake.rf.gd/5804546903.pdf
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_7034da3b8d284a33b1f392fde90905e7.pdf?index=true
    • https://s3.amazonaws.com/tokafanawa/akshara_wedding_songs_video.pdf
    • http://zomimek.epizy.com/57661523869.pdf
    • http://supavew.epizy.com/62776636629.pdf
    • https://s3.amazonaws.com/janodojivi/66283281097.pdf
    • https://s3.amazonaws.com/juduk/itinerary_template_for_family_reunion.pdf
    • http://xubeveg.epizy.com/cinema_4d_full_version_free_mac.pdf
    • http://vegewamofuxa.rf.gd/8778665488.pdf
    • https://s3.amazonaws.com/lomiwexuva/lds_sacrament_meeting_agenda_template.pdf
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_9f3735e48f4b474cb9ca7dbcf12dcf6b.pdf?index=true
    • http://pirapisanuton.epizy.com/the_treaty_of_guadalupe_hidalgo_resulted_in_brainly.pdf
    • https://s3.amazonaws.com/kozibowisenatu/ronan.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/48625959010.pdf
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_1b411effc1354133a5aa0920b0580ff5.pdf?index=true
    • https://s3.amazonaws.com/degagaziv/resume_builder_template.pdf
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_e1368f6f3d46464ca8acf09c9b5c7b5d.pdf?index=true
    • https://s3.amazonaws.com/sivanira/fly_fishing_guides_methow_river.pdf
    • https://s3.amazonaws.com/mamukawaxatali/maniac_mansion_c64_deutsch.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e18.bin
1aebb37033d9ee774f178bdd52fb3b6431122508235aa7bb131e949548d74559		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E18 5112 bytes
font_01_sfnt_off00017f86.bin
710a73a660397479086007bde5e97d3c5654ff14cfeb8714d4cb2de7760a7ea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F86 15664 bytes

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