Malicious PDF — malware analysis report

Static analysis result for SHA-256 5283a0671e16703f…

MALICIOUS

PDF

78.0 KB Created: 2021-03-09 17:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2cc9221223fb975bad6875f5f5836e76 SHA-1: a2f76af1d512b76e7505417c986630a92ae84e64 SHA-256: 5283a0671e16703f5edebdeac35a743e3b36bcf27cdc0469614d4696c274bbb0
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on disposable or potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristics. The ClamAV detection and ML classifier further support its malicious nature. The primary function appears to be redirecting users to other malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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://crophysi.ru/award?keyword=challenges+of+ecommerce+in+africa+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_6030ad4ee88a2.pdfIn PDF document text
    • https://jesebumu.weebly.com/uploads/1/3/4/6/134617302/tavusogogesomovewise.pdfIn PDF document text
    • https://wilukogata.weebly.com/uploads/1/3/5/3/135388132/tupagefedakaluzixiwa.pdfIn PDF document text
    • http://smm-target.ru/verisina65gzv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_601f318d24dce.pdfIn PDF document text
    • https://kijapipova.weebly.com/uploads/1/3/1/4/131407887/0aa7a0a.pdfIn PDF document text
    • https://tesebajaja.weebly.com/uploads/1/3/4/4/134402558/wepawuxagiwo.pdfIn PDF document text
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/vujono_pojal_webozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5fd78c630482d.pdfIn PDF document text
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/5459992.pdfIn PDF document text
    • https://wesonibisizigoj.weebly.com/uploads/1/3/0/9/130969529/pituliseganej_dusekodiwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379474/normal_5ff02d1c74f0b.pdfIn PDF document text
    • http://generatorsale.ru/lopukibuywm9x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474462/normal_5fcf3d24724f9.pdfIn PDF document text
    • https://bosofivi.weebly.com/uploads/1/3/4/6/134668799/1566205.pdfIn PDF document text
    • http://lasleymarkt.ru/jefabupewixogajisoohxqe.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/pevuwarobuvowa/improviser_s_guide_to_the_cello.pdfIn PDF document text
    • https://af8e4364-7f8a-45ec-af3e-d69da1c27fbb.filesusr.com/ugd/12c36c_e8d17334734f4221afc7360d29c4dab6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/befarekogol/16672208439.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/49283874541.pdfIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_c547e495dffa483689d70722cdc34da3.pdf?index=trueIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_9615d5f839c543eeb5d7c0d1aa63b24e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zamuriza/vudefovi.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/sojojifapenevox.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_b91b66850dfd42b6925cb1ff932ac7b8.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_f2568340b16844d7a8ed78fa104dbd69.pdf?index=trueIn 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_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 5476 bytes
SHA-256: e4e86b5f07991f65c883305110f8aa63eb2729478192f6ba215ec17cf7eff7e5
font_01_sfnt_off000105d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D0 10664 bytes
SHA-256: 46b35f7c94d52d02c6eb17d74656870113ac2a2c0b4d43053d1471fb56bb3961

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