Malicious PDF — malware analysis report

Static analysis result for SHA-256 478b99f792412046…

MALICIOUS

PDF

71.7 KB Created: 2021-03-29 21:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 752204b8ffa0393b1db14334d86fd503 SHA-1: 90804dcec9ef1fe2f2497df30f5ae6b2d2d604fd SHA-256: 478b99f7924120460811b8e3bad250d85fdc56e95eba7558e0ea1da168a45638
126 Risk Score

Malware Insights

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

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 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://xezojetit.ru/strik?utm_term=phrasal+verbs+exercises+take+off PDF link annotation
    • http://uspex22.online/494286197449u6zl.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/bsf_constable_tradesman_application_form_2020.pdfIn PDF document text
    • http://mebovaduzi.mywebcommunity.org/auxin_biosynthesis_pathway.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420776/normal_5fc6154aed3bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367667/normal_600889f466db6.pdfIn PDF document text
    • http://dipenoguzel.sportsontheweb.net/adverbs_worksheet.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/notutubesit.pdfIn PDF document text
    • http://twirlini.com/total_gym_1500_setup_instructions8w0a0.pdfIn PDF document text
    • http://xalowazejadiv.getenjoyment.net/cedar_point_map_2020.pdfIn PDF document text
    • http://sasegotib.medianewsonline.com/sap_basis_tutorial_point.pdfIn PDF document text
    • http://healthyforczechrepublic.site/22744201909viweg.pdfIn PDF document text
    • http://internet-babki.ru/the_lord_of_the_rings_the_fellowship_of_the_ring_book_summary2s6wz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366048/normal_60067f98db7e2.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/xuxoditiwikamekimodoju.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/moruvomijefo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_7e91463143cd4fda8ca2fa1cb2e05e02.pdf?index=trueIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_832ecfe2946e40e7816bd4db2725e252.pdf?index=trueIn PDF document text
    • http://pavabiza.atwebpages.com/lajovaridum.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_off0000da96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA96 5300 bytes
SHA-256: 0f3a869676324343c4179079c39fbcc4bfe7694d2b965434b2e97013a22519f6
font_01_sfnt_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 10880 bytes
SHA-256: 363e33ca16f02b3c3ee97efa54d18cc93c426ebc6b795229ce8dd1ae776fe2cc