Malicious PDF — malware analysis report

Static analysis result for SHA-256 90003ebbf19407dc…

MALICIOUS

PDF

75.8 KB Created: 2021-03-17 22:03:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c683eb86f43cb95521e2633542c622d0 SHA-1: 764e0415492279b30044c719eedaa4b75f327d8c SHA-256: 90003ebbf19407dcc674a2347bdb8fda20536938315fdf35e7d64efa3a2f25bb
156 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. 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://jacksth.ru/wix?keyword=thomas+g+pullen PDF link annotation
    • http://nitafibejuze.mygamesonline.org/vezunizukafopeduniwa.pdfIn PDF document text
    • http://jetinaxisodew.mypressonline.com/settlers_of_catan_development_cards_list.pdfIn PDF document text
    • http://kejurudoji.medianewsonline.com/company_fundamental_analysis.pdfIn PDF document text
    • http://kuwawaf.mypressonline.com/vubinelapepuwegirevu.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/advanced_english_vocabulary_list_with_meaning.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/gekomikefebe.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/how_to_write_an_essay.pdf.pdfIn PDF document text
    • https://xufiwelak.weebly.com/uploads/1/3/1/1/131164558/pumugaxuzamik-warunosige-xebududesisoxo-gatuzepezunubu.pdfIn PDF document text
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/9508222.pdfIn PDF document text
    • https://dubujede.weebly.com/uploads/1/3/4/6/134607356/3688038.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/cursive_writing_passages.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zasepo/bewenazexitilika.pdfIn PDF document text
    • http://jafixomedimun.onlinewebshop.net/78050032308.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/ikea_malm_bed_frame_second_hand.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/79476644473.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/gardners_art_through_the_ages_15th_edition_volume_2_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/72387648960.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/30_day_green_smoothie_cleanse_jj_smith.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_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 5084 bytes
SHA-256: 111b3857496e2265d09efdb2ae5400068cfe57cf1f5314fce5df783dc2009601
font_01_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 10608 bytes
SHA-256: aceeb99cbc19342d01519b4063a9332a6c639b75f300c76ae74d7373c891607e

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