Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3a506efd170671…

MALICIOUS

PDF

82.7 KB Created: 2021-05-13 08:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 59bc3e8fff21f475ae3f43ed6bc245f5 SHA-1: 0dc99d9dc6c764f54594436e3ac81fe181dceded SHA-256: 0d3a506efd1706712a5e1bb2c978b87f9f8ca1b73c9f9f62e5cedc00d6d44b05
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://fokemale.ru/strik?utm_term=problems+with+the+healthcare+system+in+america PDF link annotation
    • http://kunujunekedi.mygamesonline.org/13805343990.pdfIn PDF document text
    • https://kefenatab.weebly.com/uploads/1/3/4/8/134854159/solalozuwasuze_losawulor_kulod_radage.pdfIn PDF document text
    • https://gavanigo.weebly.com/uploads/1/3/1/3/131380609/1230157.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/xuzoseriduzeturej.pdfIn PDF document text
    • http://jesawukimefix.mypressonline.com/gemomobiwaguboreb.pdfIn PDF document text
    • https://defaxudenuged.weebly.com/uploads/1/3/5/2/135293647/govokunuror-befuv-xuvavufupalume.pdfIn PDF document text
    • http://hopecommunitynaz.com/lesuxogomedazipasufagokw59x8.pdfIn PDF document text
    • http://weinmvc.net/ratoruwifosomamulerorufaeiur.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/sales_qualification_process.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385214/normal_5ff0e2723ae09.pdfIn PDF document text
    • http://blancop.xyz/adguard_premium_apk_final4zse9.pdfIn PDF document text
    • http://remont-kholodilnikov.website/manomowipomofajbmc40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452373/normal_6034856a765f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_605b59d8809cd.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/42678301700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_60537a9e1999c.pdfIn PDF document text
    • http://masterpowerpoint.com/how_to_write_a_chaotic_evil_characteroandx.pdfIn PDF document text
    • https://jogelobob.weebly.com/uploads/1/3/5/9/135961552/raveropegizazaz-bekatevirali-dapapipap-nawipa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_7654bce55b5f49e6b232b7135f22f492.pdf?index=trueIn PDF document text
    • https://e0529b0e-ffd4-46ae-8a9e-348c3aa8e3ae.filesusr.com/ugd/27320f_6c9e7fb444394e89ba889e3f518209dd.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_6507ebdf746849669d173e983dfe8e72.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_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 5376 bytes
SHA-256: ce501fca2b07fcf9d8959c9bb5d235d2c71c68f5e981efac3746fa9c6eb82636
font_01_sfnt_off000113bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BD 11652 bytes
SHA-256: e2821b1bdfdb15f6751d98203d7e4dff56df6aceff3f32e28f07fd4ae0336cab