Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4500b4b32ebd297…

MALICIOUS

PDF

77.7 KB Created: 2021-03-29 08:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: da773c0bb3d5aa6366de34198089302c SHA-1: 2537b73d79caac3a8247cb127bd2260e16061757 SHA-256: f4500b4b32ebd2977a8dd8d3a1091e4298870b3279951e8f2a08a595f4b957b0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains numerous external links, with a significant number pointing to Weebly-hosted PDFs, indicating a potential link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the primary goal is to redirect users to malicious or SEO-spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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.
  • 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/wix?keyword=is+fruit+salad+a+element+compound+homogeneous+or+heterogeneous PDF link annotation
    • https://nodopotol.weebly.com/uploads/1/3/4/0/134018708/0f4ed9006c8c1c.pdfIn PDF document text
    • https://tutuludoj.weebly.com/uploads/1/3/0/8/130874598/lapulupisisogoj_tosenujumivotor.pdfIn PDF document text
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/8350285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461751/normal_60160c1c5c942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_600ae3b228e66.pdfIn PDF document text
    • https://kovirelumen.weebly.com/uploads/1/3/0/8/130873776/patifupet_zaramivadoxi.pdfIn PDF document text
    • https://xewimimami.weebly.com/uploads/1/3/1/8/131857815/guzisesasuvipu.pdfIn PDF document text
    • https://dajukufatob.weebly.com/uploads/1/3/4/3/134345308/lomerig.pdfIn PDF document text
    • https://nugivukowunel.weebly.com/uploads/1/3/4/0/134041243/3229981.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/1969673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_603f474fb3b75.pdfIn PDF document text
    • https://zidesefaw.weebly.com/uploads/1/3/2/6/132680856/zosofadi_retukogufe_pekivoligemog_ropunina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416666/normal_5fd7a6dc688ac.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/ruwaluwojazudax.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/dukexajuj/munenobagowusijem.pdfIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_ffa85889f3894f649037cc97df333c9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/biochemical_evidence_for_evolution_lab_12_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/antibiotic_prophylaxis_dental_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/mexiwegexed.pdfIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_45f3be0549a44a62ad6c7d5bac090cee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/sigaterafig.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/chorioamnionitis_rcog.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/84583686270.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_986bfd56e5e7412495bfc13a322701a5.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_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 5504 bytes
SHA-256: f63e08ad16f109a2976abf15979f17ddf4ade6d74f5bf38dc2023c7190fbc867
font_01_sfnt_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 10412 bytes
SHA-256: 25bd8e695fdc62f7c33786b2185b66ded1412cf3082494a01bd9a98003054845

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