Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9d951374045476…

MALICIOUS

PDF

80.7 KB Created: 2021-03-03 11:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cce466d19daac21dadb7d769341ba6b1 SHA-1: d1ca584f46a4534769920d32906c8bb45f5a481d SHA-256: 6c9d951374045476cfae7c07a75ab719801ed9a8a947d18663e04acb24af79d8
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that likely lead to phishing or malware distribution sites. The document body, though heavily obfuscated, suggests a lure related to 'Jumper's knee treatment protocol'. No scripts were extracted, but the PDF structure itself facilitates the redirection to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gimoguvi.ru/123?utm_term=jumper%2527s+knee+treatment+protocol
    • http://bagerisevi.scienceontheweb.net/zavuwezizufevobolimesi.pdf
    • http://xuvaxujogilo.mygamesonline.org/what_makes_islam_a_universal_religion.pdf
    • https://rutedidatares.weebly.com/uploads/1/3/4/4/134490949/9173478.pdf
    • https://disepijov.weebly.com/uploads/1/3/1/4/131438002/01f3039b69.pdf
    • http://sitizinudex.getenjoyment.net/venta_humidifier_cleaning.pdf
    • http://munasimowijuxi.getenjoyment.net/hp_elitebook_2760p_core_i7_price_in_bangladesh.pdf
    • https://mokenexub.weebly.com/uploads/1/3/4/4/134478104/215966.pdf
    • https://satiragekawojiw.weebly.com/uploads/1/3/2/7/132740750/3061892.pdf
    • http://jemulobapamiwu.mywebcommunity.org/mibuzedapeworalikos.pdf
    • https://lojopozubog.weebly.com/uploads/1/3/1/6/131606756/426c25e3c72fe06.pdf
    • https://vidatizotasajad.weebly.com/uploads/1/3/4/0/134017381/pofovefebopemutuna.pdf
    • https://bagekitavaseb.weebly.com/uploads/1/3/1/0/131070055/2673870.pdf
    • http://luwogexejel.getenjoyment.net/manual_de_pedalera_digitech_rp80.pdf
    • https://rawubewo.weebly.com/uploads/1/3/1/4/131405976/jusujeseru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f021.bin
a8ecca6494e76b1ad81fc975f4639fb1dfd8aa78fabd2d7b4c236d6938ac8e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 5000 bytes
font_01_sfnt_off0001010a.bin
06406020ec9a94f5e395679fc780e266c04a957931afecc584a544cb4699bb6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 10832 bytes
font_02_sfnt_off000125df.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125DF 4324 bytes

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