Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe229fbe9c3ffef…

MALICIOUS

PDF

80.5 KB Created: 2021-05-14 09:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1923b2c72b9905bc7c4b69c136de6585 SHA-1: 9665ea9265518014d151f46851393e13b0735c72 SHA-256: dfe229fbe9c3ffef52e35f0608bff6c8df11a4a95346a3e501d4aaf56281c476
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure point towards an attempt to distribute malware or phish for credentials.

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://botokaw.ru/strik?utm_term=el+guardi%25C3%25A1n+entre+el+centeno+explicacion+final PDF link annotation
    • https://samabuwe.weebly.com/uploads/1/3/0/7/130739499/04690b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_600acee1637ce.pdfIn PDF document text
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/dibemive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451941/normal_6066fc51410bf.pdfIn PDF document text
    • http://rowomonug.mywebcommunity.org/27637722986.pdfIn PDF document text
    • https://guxulixekakuved.weebly.com/uploads/1/3/5/2/135294256/sepekuvuku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365619/normal_5fdf599e77572.pdfIn PDF document text
    • https://rojogibolodo.weebly.com/uploads/1/3/0/7/130775817/3843209.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/how_long_is_ruud_furnace_warranty.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487903/normal_5fe47e03a8dd4.pdfIn PDF document text
    • https://sojujigun.weebly.com/uploads/1/3/0/9/130969910/8872505.pdfIn PDF document text
    • https://dowusezawidi.weebly.com/uploads/1/3/3/9/133997386/2aea86991a43.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/twinkle_twinkle_little_star_ukulele_tab.pdfIn PDF document text
    • https://zuzotupewumu.weebly.com/uploads/1/3/4/6/134691050/22df839bdcc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a9b72ff8-ed6f-4212-96c6-d467cc4e2332.filesusr.com/ugd/7f5649_9cab6ac2bbc146d3b37552b49cd43585.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d3718ee-8d95-4101-9bf7-e5a1b13d7e8b/12064352228.pdfIn PDF document text
    • https://4c38db24-2924-4bf2-81c9-04860d987a69.filesusr.com/ugd/a68d8f_044730dc4b7344d58ab7716865d1e4fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/838eeb14-5c30-4dd3-95c6-76cb3d06b9f3/40351278126.pdfIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_c9941a9fc363419dbc5658b0e34767a6.pdf?index=trueIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_ba335ee796204f808b281a0527dc163e.pdf?index=trueIn PDF document text
    • http://sodowurivav.onlinewebshop.net/ocr_a_level_computer_science_revision_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0aa8749-1197-4175-9af1-0e02ba3c44c0/timamebadebogal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca5dce46-12a1-4f80-83eb-3faa94540ab2/advanced_trauma_life_support_online.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/69626852534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79cdc7a0-03b5-4a0d-abc3-26465e6df5d1/15753429631.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 5404 bytes
SHA-256: b866b0f316aa5bdb66e5b2f22caa2fae3428c023f4c655011a30402e9fd583eb
font_01_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 12808 bytes
SHA-256: aba497fb6420a4eded988903a93d5ccdb91a5ede54d463b2c3bd9809d7e5a59d

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