Malicious PDF — malware analysis report

Static analysis result for SHA-256 098e4c1674fc0156…

MALICIOUS

PDF

78.2 KB Created: 2021-03-24 18:22:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0f23c49b895f303d6a8400def5437472 SHA-1: da3d08aa4b858950b8ee02f50a0ec6edb9f85616 SHA-256: 098e4c1674fc0156db34062535207811946cd446c1b9fc8d4343520d1a8fb7fe
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, including one that impersonates a 'Netflix video error' and directs to 'https://nipisod.ru/123'. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious phishing content. While no scripts were extracted, the embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/123?utm_term=netflix++video+error PDF link annotation
    • http://tonemisi.medianewsonline.com/jakosaj.pdfIn PDF document text
    • https://cdn.sqhk.co/zonurubo/zCYngge/cara_membuat_tepung_ampas_tahu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468871/normal_6037036337cf6.pdfIn PDF document text
    • http://rezexepenoma.scienceontheweb.net/44534810049.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/how_to_use_a_krups_waffle_iron.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/fikane_sanakuxapuj_wopalola_dizulemojero.pdfIn PDF document text
    • https://cdn.sqhk.co/lunapolakezo/7bNHmha/fumotunokigomipesuniziju.pdfIn PDF document text
    • http://kuzososo.mygamesonline.org/can_t_take_my_eyes_off_you_lyrics.pdfIn PDF document text
    • https://dawikuwavuvuka.weebly.com/uploads/1/3/4/8/134866752/gukokifatinu.pdfIn PDF document text
    • https://cdn.sqhk.co/xumupojamax/icudjgF/39181134600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446035/normal_5fdb264ed12d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_6030f954c6653.pdfIn PDF document text
    • http://gazajujana.mygamesonline.org/tratamiento_del_cancer_gastrico.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422628/normal_6057baabaca88.pdfIn PDF document text
    • https://tiwovukixata.weebly.com/uploads/1/3/4/3/134314311/2efc4a13fc.pdfIn PDF document text
    • https://zowuxebikazusi.weebly.com/uploads/1/3/4/6/134654267/mutekadites.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_64e52b86d6924d14b25c120ba9b9130f.pdf?index=trueIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_900f32b0e21143d98f9aed574c40cf58.pdf?index=trueIn PDF document text
    • http://sabixukavizom.myartsonline.com/ruxirurarafineruni.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_off0000f8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 4612 bytes
SHA-256: 996690999d2eb4341b3d621ef014a2218c35b6aa6f5501569291c6de9016a850
font_01_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 10296 bytes
SHA-256: d87a7c45f087d7120c494097c3d83a20bb331eaa8cf7e207e3ecc5cd10e2add2

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