Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb78479c673e54a…

MALICIOUS

PDF

82.5 KB Created: 2021-03-21 02:32:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d25cbccb0195ed81ab18900906be6bf3 SHA-1: 53f3d2a7f7fcdb7f7d475afd1484641839606051 SHA-256: 8cb78479c673e54af0a45b0ca8960a0af58e2e5c0c6e68e7a4f3270fc3d28b93
156 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 0.9998

Heuristics 5

  • 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.
  • 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=types+of+managers+personality PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489834/normal_6004173c182f5.pdfIn PDF document text
    • http://satumatajug.iblogger.org/fibroids_in_pregnancy_guidelines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448548/normal_5fe42818c974a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5fd935a5b907d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479236/normal_5fff0df8cf8e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379970/normal_5fe4be5054af2.pdfIn PDF document text
    • http://imm-shoes2.club/biwemebunijezbyt3.pdfIn PDF document text
    • http://pss77.ru/61209343566yc16x.pdfIn PDF document text
    • http://gosunenibunale.getenjoyment.net/53506184322.pdfIn PDF document text
    • http://xagevogewa.medianewsonline.com/ancient_history_notes_for_ssc_cgl.pdfIn PDF document text
    • http://elinekici.online/polini_pocket_bike_partsl2z2i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_602fd7e1555f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384030/normal_600471c074d4d.pdfIn PDF document text
    • http://bekunogoxabune.iblogger.org/apply_for_passport_online_application_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385202/normal_5fff24b59919f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mepogevotu.epizy.com/video_player_apk_cracked.pdfIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_7f816f73bb0b4ddfb3b66c29f13a167c.pdf?index=trueIn PDF document text
    • http://lizolubemerawi.epizy.com/todoxobeguravarusuxage.pdfIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_6ab3bcb452df4d4eafb75d6d45dba1d1.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_off00010050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10050 5272 bytes
SHA-256: 6a4fcbb873ce96fea1826f25df6114afc5f8cf3a16d8cbd70bde539ec3a34676
font_01_sfnt_off00011233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11233 12324 bytes
SHA-256: 81e71e1f8c960512dc9122efcf80b3ec4116854f1cf84ca976d351361a97db64

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