Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a370a90b60c574…

MALICIOUS

PDF

72.6 KB Created: 2021-03-21 07:23:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0f5aa3ca0834757d990d1e6e3151dc6f SHA-1: 2b3d14a69e5a40882fc1290e27a2f3050b34ef13 SHA-256: c8a370a90b60c57414ff4c498ef52473f3bb1f89810d65ef67c77e814b4bd93f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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 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 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://fokemale.ru/strik?utm_term=how+to+do+z+table+on+ti+84 PDF link annotation
    • https://sixodajumam.weebly.com/uploads/1/3/4/3/134311071/8525929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_6013d9a033610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_600ca59581a91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412607/normal_60304f945480b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_603581e8aa763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451940/normal_604e4dfa634da.pdfIn PDF document text
    • https://dowawanezezezo.weebly.com/uploads/1/3/1/0/131070762/kukujitigopuju.pdfIn PDF document text
    • http://superheatbelt.xyz/unlock_asus_memo_pad_7_lte_clandqlsx.pdfIn PDF document text
    • http://acupofjacob.com/94368971363zxirz.pdfIn PDF document text
    • http://mon-cmso.best/the_complete_works_of_florence_scovel_shinngui50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_601718dbbef76.pdfIn PDF document text
    • http://winfreeiphone.xyz/tv_channel_logo_quiz_answersarcui.pdfIn PDF document text
    • https://gagavupotiwek.weebly.com/uploads/1/3/0/8/130813998/palonepeberopaz_lipoj_vesokejoro_sefuzelawok.pdfIn PDF document text
    • http://nubolats.xyz/gmail_app_icon_blackcbphr.pdfIn PDF document text
    • http://vezerfa.xyz/25628802948kfuns.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5fc73243bcaa4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5fe1972b51995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443624/normal_5fd2f880dfb61.pdfIn PDF document text
    • http://gawudubigojan.getenjoyment.net/breath_of_the_wild_complete_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491965/normal_600fbc894ffc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guxejusoselota.myartsonline.com/sowima.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_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 5072 bytes
SHA-256: 5343cc88078af260dd97154a95f967728874270f3629dde0abb72d1952e61dea
font_01_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 10204 bytes
SHA-256: 03f7c5c0372f55b9228f3adab3389f54b6cc16a4648fbf18425461a6e3344067

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