Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a126e7366590aa…

MALICIOUS

PDF

74.2 KB Created: 2021-05-31 18:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b8660060759a6fc023cb2a28a941e836 SHA-1: 5c3011abbd7bafa401acdc961a2430ff19eef90f SHA-256: d7a126e7366590aa71f5b74649fdaf466e067134135cdbfe6fe3af9801980a39
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://coretry.ru/pbw?utm_term=velozes+furiosos+3+filme+completo', is presented as a search result for a movie, likely a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://coretry.ru/pbw?utm_term=velozes+furiosos+3+filme+completo PDF link annotation
    • https://kivuxobusev.weebly.com/uploads/1/3/1/8/131871605/9eb9a73b05.pdfIn PDF document text
    • https://dunijolojuk.weebly.com/uploads/1/3/1/4/131437931/firuratu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403819/normal_5fcd458783fdd.pdfIn PDF document text
    • https://kolekidir.weebly.com/uploads/1/3/4/4/134441437/xafuv.pdfIn PDF document text
    • https://fopizute.weebly.com/uploads/1/3/4/3/134315067/7025096.pdfIn PDF document text
    • https://ponawexem.weebly.com/uploads/1/3/2/7/132740185/ca81b3a0.pdfIn PDF document text
    • https://sukesiguwote.weebly.com/uploads/1/3/4/1/134132294/wibugur.pdfIn PDF document text
    • https://kixufeme.weebly.com/uploads/1/3/4/0/134018387/429128.pdfIn PDF document text
    • https://bewimesev.weebly.com/uploads/1/3/4/7/134753962/ferexawa.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/34e648dc148ec8a.pdfIn PDF document text
    • https://rororejiwep.weebly.com/uploads/1/3/5/9/135966539/93a5e32dbae62d3.pdfIn PDF document text
    • https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/kuzilusuv-negubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496170/normal_6069436ee3847.pdfIn PDF document text
    • https://kimetupuvojum.weebly.com/uploads/1/3/2/6/132680977/c8042b3dca22851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475000/normal_601f0f436c8da.pdfIn PDF document text
    • https://leduxuma.weebly.com/uploads/1/3/2/8/132814900/tagume-tirirotiw-rusomewijod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zemenifinabe.pbworks.com/f/96352728075.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144412599/discografia_fito_y_fitipaldis_descargar.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/28667186608.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/11912868328.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 4904 bytes
SHA-256: db3aa8999e94ed25b1c27a7710eb606755c7f830a9b641e552533a8bab0bafb0
font_01_sfnt_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 12608 bytes
SHA-256: dc25edb310b7a817ec4eba25d521fc9f055dbca02338e954527cacb2dd911b69
font_02_sfnt_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333