Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ed4d61c7e1e5cc…

MALICIOUS

PDF

75.0 KB Created: 2021-03-09 16:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3cf501e92ece6b91d1affe38da8c4f08 SHA-1: af1083ad2f4a390fdaea299919100847cfbf4595 SHA-256: 42ed4d61c7e1e5ccd2528eaf392c0ae9da5cada01bcfc0349289c036fac61523
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or distribute further malware. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or SEO spam attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://druttle.ru/award?keyword=core+java+technical+interview+questions+and+answers+for+freshers+pdf PDF link annotation
    • http://tazaros.iblogger.org/business_card_template_blank.pdfIn PDF document text
    • https://cdn.sqhk.co/koletexun/vEF4jeT/wefije.pdfIn PDF document text
    • https://nisozamiroxub.weebly.com/uploads/1/3/0/9/130969329/7210494.pdfIn PDF document text
    • https://vegonivi.weebly.com/uploads/1/3/5/9/135986737/fb49577da871.pdfIn PDF document text
    • https://givunanisu.weebly.com/uploads/1/3/4/8/134848628/jewopovelod.pdfIn PDF document text
    • https://jubibololir.weebly.com/uploads/1/3/2/8/132814038/2833d8376c63.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/bMjadjg/cheating_tom_2_apk.pdfIn PDF document text
    • https://xinuluparos.weebly.com/uploads/1/3/0/9/130969110/ropumokokajavep-zulugilezugu.pdfIn PDF document text
    • http://jimefat.22web.org/81368761519.pdfIn PDF document text
    • https://vokarojunez.weebly.com/uploads/1/3/2/6/132696330/b4805d9136397.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sokurunofizune.rf.gd/parugipizesapaletixum.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_1297ad98948f4124b69ee6fd599f652e.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_e388ad5f8b2b4cd9a5c96d3c0246270c.pdf?index=trueIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_c4a9c9a7905442b086207fc2473673fb.pdf?index=trueIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_7790bd2ecda449ce95ebe81fe1b58dcc.pdf?index=trueIn PDF document text
    • http://tuzegonu.rf.gd/washington_post_review_of_whered_you_go_bernadette.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_1765e5adb7c746deb0258dfd7c7315f0.pdf?index=trueIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_f4d0b723e7f74514abeb6ef7c870ab68.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_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 5504 bytes
SHA-256: 5dc6cb6492ae60444bf2875244329e6ed741b5692e1d70a7f043ec63c046781c
font_01_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 10472 bytes
SHA-256: bfa17997759421e30aa7da4fd8cf3a04bdf4e8ad2fdadb563f229cde51da8406

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