Malicious PDF — malware analysis report

Static analysis result for SHA-256 383c1570f29286c4…

MALICIOUS

PDF

85.8 KB Created: 2021-03-11 00:57:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c83dbb8a379fb75339f25df9d789b71f SHA-1: 7c09e6750ade03f51fce650d7e6eecf65fc67142 SHA-256: 383c1570f29286c49bc42424c4511258007d09091628056cd942eca4aca8e194
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used in link farm attacks to improve search engine rankings for malicious content or to redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URL points to a domain associated with potentially malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/award?keyword=candida+cleanse+diet+plan+pdf
    • https://boxizegovabore.weebly.com/uploads/1/3/1/3/131379280/9059548.pdf
    • https://muruvarulem.weebly.com/uploads/1/3/1/4/131406835/dupagiji.pdf
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/xezawemetebesuzo.pdf
    • https://verebabivudasa.weebly.com/uploads/1/3/4/7/134771522/3bdbbcf.pdf
    • https://penogefuf.weebly.com/uploads/1/3/2/7/132740618/zeduw-farano-nofisu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_5ecc3317b78249068694a09c3a404bd8.pdf?index=true
    • https://s3.amazonaws.com/zarusegibitumet/92889474093.pdf
    • https://s3.amazonaws.com/mogedozara/plot_diagram_template_with_definitions.pdf
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_85086c2de03a4c0a8fb65c99b71a4963.pdf?index=true
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_3c8e70e5e3a543bbb152c10b3aae867c.pdf?index=true
    • https://s3.amazonaws.com/niwotipugonuvoz/fomogi.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/22889648967.pdf
    • https://s3.amazonaws.com/risisipajole/introduction_to_nanoscience_and_nanomaterials.pdf
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_7fcc17471068455f87a0c5e1d386adc7.pdf?index=true
    • https://s3.amazonaws.com/rotowan/fasejawet.pdf
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_e142cde94bf344e191bf9b8d04559aba.pdf?index=true
    • https://s3.amazonaws.com/kelukakeb/tamil_new_movies_hd_website_list.pdf
    • https://s3.amazonaws.com/tokatefozude/aarhus_convention.pdf
    • https://s3.amazonaws.com/kelukakeb/vimanomimogizedigirawuv.pdf
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_16774129d8b94fa98f492c3ede4158e1.pdf?index=true
    • 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_off000115e6.bin
c2f544e0cbd3745741a168a3e201d4f771f00078fd87c7de56a47494ea7dbef2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 4960 bytes
font_01_sfnt_off000126db.bin
3b2c055d345389b6b73c5476637c5714ea3a59d0f4e5d41ba692869c389cdb03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126DB 10288 bytes

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