Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc1838c83b3ac23…

MALICIOUS

PDF

81.4 KB Created: 2021-05-29 17:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 787646a3072985f025e0a5e60f67d82f SHA-1: 25474d56a9cd8b9d66716fddb4d669c726958c41 SHA-256: afc1838c83b3ac23fa77dd126708a9cbaa94276cad37e69aa99216b5d84672df
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious websites. The primary URL points to a page about recovering Android data, a common lure for phishing or scam operations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/strik?utm_term=how+to+recover+data+after+factory+reset+android+free PDF link annotation
    • https://batusuxejodasav.weebly.com/uploads/1/3/1/8/131857782/juzodegituzemit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475861/normal_6024f4791ba15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459787/normal_60374c386b5b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471484/normal_602722d55c5ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368732/normal_5ffe55e6e2c1c.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/zuxijeziza.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/busate_dekezomavuwono.pdfIn PDF document text
    • https://bapidovomefizeb.weebly.com/uploads/1/3/4/3/134382768/5342625.pdfIn PDF document text
    • https://wogizepi.weebly.com/uploads/1/3/5/3/135388010/2be3f7.pdfIn PDF document text
    • https://keminozabigorez.weebly.com/uploads/1/3/4/8/134886120/e0bce1e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410027/normal_601851c325f35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485821/normal_60367ba749eba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376088/normal_5fdf1c4143f1f.pdfIn PDF document text
    • https://logosomuzabi.weebly.com/uploads/1/3/0/9/130969340/samofezo-fadig-dorixenado-muzibixigib.pdfIn PDF document text
    • https://setixifofu.weebly.com/uploads/1/3/1/6/131606861/risur_vudinunisijex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_5fd2c0c9bba5c.pdfIn PDF document text
    • https://wusafasugulub.weebly.com/uploads/1/3/4/5/134586051/1362778.pdfIn PDF document text
    • https://nebofubegifeso.weebly.com/uploads/1/3/1/4/131437549/0c6feebb.pdfIn PDF document text
    • https://budasanufewe.weebly.com/uploads/1/3/5/3/135323580/kerosakuj_fison_jumes_xigutowevigiti.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/f6a4f84f-2a14-4ce1-bfaa-a61a1e6623d5/multivariate_time_series_analysis_with_r.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c2e78f7-347e-40b9-bf26-eb0b982d1ba7/24014919837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eec02c4-06f6-48b2-9756-47f4377b1deb/zojemobewikeloz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29de93e-b452-4ac2-a9c0-3aadc7d9aed1/where_to_donate_coats_in_nyc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 4984 bytes
SHA-256: 1232a63c4b857dbd361cd0903bb04b9eb7278d98e857e93eccf514c5ebe3fbee
font_01_sfnt_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 11156 bytes
SHA-256: 0a42de319c490ce534ad32b982aba1ef3122c6234bf493958ed7487b8aa9ab9e
font_02_sfnt_off00012805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12805 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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