Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d4236f36471275…

MALICIOUS

PDF

67.3 KB Created: 2021-03-12 18:48:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a229f750ede7c0701310c3f2e49e257b SHA-1: 2b80851511fb61e8ea58eb54b5e0fcfbc1603a63 SHA-256: 08d4236f364712750cb521aaec9b7520a71f89aa9f27780dc1b57e82ebdc80fb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one URL pointing to a potentially malicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest it's designed to redirect users to malicious content, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=strawberry+dna+extraction+worksheet
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/535868.pdf
    • https://piramejujidizek.weebly.com/uploads/1/3/4/6/134694247/somunasom-ninimeruz.pdf
    • https://voloxamofe.weebly.com/uploads/1/3/0/8/130874475/425a09690f9.pdf
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/jadaripotutasot.pdf
    • http://tuwiximobibatud.iblogger.org/98089791996.pdf
    • https://cdn-cms.f-static.net/uploads/4489411/normal_602828b3a05a6.pdf
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5fd8cd0e257b7.pdf
    • https://static.s123-cdn-static.com/uploads/4366304/normal_5ff6624ad2946.pdf
    • https://nupuwumot.weebly.com/uploads/1/3/5/3/135305030/dfde8f2b.pdf
    • https://nazolaruwesibag.weebly.com/uploads/1/3/1/4/131453197/6546004.pdf
    • http://nimojojisox.22web.org/pukesabupexodajovo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wanikokod.epizy.com/temuvuj.pdf
    • https://s3.amazonaws.com/gupawupigawono/pagipefuzusarof.pdf
    • https://s3.amazonaws.com/jixeremipet/asphalt_nitro_hack_new_version.pdf
    • http://lavovexerok.epizy.com/27706464406.pdf
    • http://rebokomixuxoj.epizy.com/food_safety_temperatures_celsius.pdf
    • https://s3.amazonaws.com/gidibesuxi/apple_service_diagnostic_software.pdf
    • http://goromanoza.rf.gd/aruba_clearpass_mib.pdf
    • https://s3.amazonaws.com/baxunaf/bukhari_shareef_urdu_translation_free.pdf
    • http://xumugipetoje.epizy.com/wezipujuwefe.pdf
    • http://safonakidu.rf.gd/symposium_plato_meaning.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb70.bin
cd6437abbdc7f37b0767bfcf58c9de3a3bde6f8ed38ec72485a04f8c06699e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB70 5564 bytes
font_01_sfnt_off0000de6e.bin
715b79977de110119528d50f7c8193ca707bb20ba676ade970b85942cb3ec83f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 9696 bytes

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