Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d094a798f9b3e5…

MALICIOUS

PDF

90.8 KB Created: 2021-05-03 23:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0eb7bd7f130ac9796cfcfa55ee734cbf SHA-1: ddfacdfee13c1bbc61af929668acf33e27948917 SHA-256: b7d094a798f9b3e5c5ddb2d3f42fb777f7c61cfe613983e13a3c1c9079e7c873
186 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 0.9992

Heuristics 6

  • 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.
  • 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://soxebez.ru/strik?utm_term=how+tall+were+giants+in+norse+mythology PDF link annotation
    • https://cdn.sqhk.co/lomekojop/jcQhhhg/vuvazunegosupulerobunowet.pdfIn PDF document text
    • https://pobanebutu.weebly.com/uploads/1/3/4/5/134592169/vinexozewus.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/ZXigBjb/tesesoxebi.pdfIn PDF document text
    • https://bituxomixa.weebly.com/uploads/1/3/4/1/134131270/gawagumu.pdfIn PDF document text
    • https://logizovaxe.weebly.com/uploads/1/3/4/5/134506690/migadujajiwa_korix_xigitegemur_zaviwupepad.pdfIn PDF document text
    • https://latimemoniborij.weebly.com/uploads/1/3/1/4/131437487/pudude-peguwepur-duwokorew.pdfIn PDF document text
    • https://cdn.sqhk.co/fetogivaw/gQas1oq/25423436205.pdfIn PDF document text
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/404023.pdfIn PDF document text
    • https://nikupotipemami.weebly.com/uploads/1/3/0/9/130969226/ebf5ef839406.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/gehbjid/58291030345.pdfIn PDF document text
    • https://bijazebis.weebly.com/uploads/1/3/1/3/131382141/gupal_rilapixuv_bolas.pdfIn PDF document text
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/1445659.pdfIn PDF document text
    • https://tadafami.weebly.com/uploads/1/3/4/3/134386911/54a129ca.pdfIn PDF document text
    • https://purelukanixavaj.weebly.com/uploads/1/3/1/4/131454065/1104632.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/jajoxulabojaso/panuluniziwoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6af07f-2c46-44db-be9e-3443917969b8/hoff_bayesian_statistics.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/castlevania_symphony_of_the_night_speedrun_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/78359560234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9519265-cac3-4319-a275-f7f9b9902518/the_effects_of_climate_change_on_plants_and_animals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81f90efd-75a4-41fc-9ec5-c1cb520b50d8/sagavitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf77f799-0727-411e-b807-22574ce1317b/fozif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a39ef5-840d-4b3f-979c-c482f5a229ab/guardian_ad_litem_florida_optima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/065ed638-326c-434d-933b-3092daac608a/kixerit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7afad526-178e-40c2-bdb7-59d7298f6876/kawosibedulomusele.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_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 5252 bytes
SHA-256: 616f3952f7810def9bd4a4608efd9d7306d12c172b6431298344d6fa9ee049e2
font_01_sfnt_off00013319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13319 12224 bytes
SHA-256: a891fdc72e89d5ebc6f439bcd964005ee539cce00bfc18e3e4a9171cbe0a41d2