Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8657e8f2b65dd0c…

MALICIOUS

PDF

87.9 KB Created: 2021-02-08 02:57:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0d421b8b243d733bd6c4f5083fdb9099 SHA-1: 7cde2086140ebb9e3c2c593c6f0aadb9398e15e0 SHA-256: e8657e8f2b65dd0c7e013b4892f1712a9ee0793c2fda30beaa28a55ddc82e575
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious domains. The document body, though heavily obfuscated, contains references to URLs that are likely part of a phishing or malware distribution scheme.

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 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://bologen.ru/123?utm_term=dave+barry+how+to+argue+effectively PDF link annotation
    • http://0fruit.space/26788486397jf3jw.pdfIn PDF document text
    • http://maxidadikegi.iblogger.org/kibofobopudobeguz.pdfIn PDF document text
    • http://ruvejufagofo.22web.org/48404464166.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452624/normal_5fe1b6d608197.pdfIn PDF document text
    • http://vaxuzorokolate.iblogger.org/soulcalibur_vi_yoshimitsu_guide.pdfIn PDF document text
    • http://health2health.online/similarities_between_samurais_and_knightsvtlw9.pdfIn PDF document text
    • http://liko-sneakers.com/pumavomevumujjt5as.pdfIn PDF document text
    • http://alteramaks.world/crush_crush_beach_ballsgi63t.pdfIn PDF document text
    • http://guwajokuxo.22web.org/67661000278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489244/normal_5fd2c75c94823.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikisitakas.rf.gd/uniform_cost_search_in_python.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/wubiz.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/polycom_realpresence_app_user_guide.pdfIn PDF document text
    • http://warunegiluj.rf.gd/32315363282.pdfIn PDF document text
    • http://voratibix.rf.gd/48191629659.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/jigsaw_puzzle_template_24_pieces.pdfIn PDF document text
    • http://lafatakijuton.epizy.com/80952002587.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_off00011bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 5356 bytes
SHA-256: 2d037d05794fd34607d99985bdcb17a67d39f50ae1dfd2d604bcea363b34b42c
font_01_sfnt_off00012e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0F 10628 bytes
SHA-256: 9e5400015a357c5b9852989fbc09438195af36771d45ec1f2cca64bed750a7ef

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