Malicious PDF — malware analysis report

Static analysis result for SHA-256 416c20eff9c05988…

MALICIOUS

PDF

82.1 KB Created: 2021-05-10 09:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9d3e52fa7008c4c9e14527de5573b958 SHA-1: 6673f6d3cd77e2cdbbcd1c53d377d8ecdab13614 SHA-256: 416c20eff9c05988d937ab19c9fad254a1b9fbaa4613f638ee5f9a132eaa1c63
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://resalured.ru/strik?utm_term=the+lady+with+the+toy+dog+chekhov PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469643/normal_60420647d2e5b.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/php_web_development_tutorial_free_download.pdfIn PDF document text
    • https://fozixaxo.weebly.com/uploads/1/3/4/6/134665632/mafufi-xewolamasojamu-lujomu.pdfIn PDF document text
    • http://dovujaxemedu.mygamesonline.org/jarchas_y_cantigas_de_amigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501486/normal_6062de24aa511.pdfIn PDF document text
    • http://maxiteguf.medianewsonline.com/raxezodutuxuxo.pdfIn PDF document text
    • http://letinebab.mywebcommunity.org/causas_del_sedentarismo.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/ranejalemo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416514/normal_5fe3b6858d874.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/ap_eamcet_2020_dates.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb7ae0bc-69c2-4833-8adb-ed465737bb77.filesusr.com/ugd/23493e_c1671d1b99044c9cabb261ca84c1433f.pdf?index=trueIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_b820d424c06f43398989f84184eb4eac.pdf?index=trueIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_821b7b29ae774b5197e8f4ddd4a28e7f.pdf?index=trueIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_ed50c89c38a04bf6a18426ce1326510c.pdf?index=trueIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_1036c0e9aa024a8c8be44cb796f499b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/33815474763.pdfIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_ee73187f28f3426293b5d80ee334915e.pdf?index=trueIn PDF document text
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_929efa6116db4b14a58b41c38ec5d44f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/9953495906.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/pitosaxal.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_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 5196 bytes
SHA-256: d7111478704b609c6318674132996e1ca584f9a0f1820a079deafa0e04658aee
font_01_sfnt_off0001144f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144F 10856 bytes
SHA-256: 19937b3c50509ddddaf1a85a06c3072dfb5b823e45454359233b2fadae6df7d0