Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6a36d7a6a33dc8…

MALICIOUS

PDF

74.8 KB Created: 2021-06-09 18:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f49ab910d7e9b3d8c688c0e7568e3e49 SHA-1: a9abcfce4aef198554cba5d629ad65dd0d337351 SHA-256: dc6a36d7a6a33dc831842afe7153bd18b8547fbfb057773b4a436f37610d309a
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm or redirection scheme. The primary URL, 'https://irlanc.ru/pbw?utm_term=watch+diary+of+a+wimpy+kid+movie+free+online', indicates a lure related to popular media to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

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://irlanc.ru/pbw?utm_term=watch+diary+of+a+wimpy+kid+movie+free+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374860/normal_6062976b8592a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421623/normal_5fedd0a9db848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495050/normal_5ff87129ae4fd.pdfIn PDF document text
    • https://ledobosu.weebly.com/uploads/1/3/1/3/131383424/loligokavijumepog.pdfIn PDF document text
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/xagawifoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_603f0d56262da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_602f84bb1d4e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414682/normal_60298771791f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452835/normal_6040d94795680.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458826/normal_5fe1b8cc4179a.pdfIn PDF document text
    • https://bewimesev.weebly.com/uploads/1/3/4/7/134753962/3039163.pdfIn PDF document text
    • https://nanupiwe.weebly.com/uploads/1/3/1/6/131606486/gizadawubawomudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408989/normal_6062dfde77a96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483839/normal_60651f6948d3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420222/normal_600fda18a60b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375199/normal_5ff65979794a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_603aff812fc13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mapijakemifo.pbworks.com/f/the_intelligent_investor_the_definitive_book.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/w/file/fetch/144501516/daseje.pdfIn PDF document text
    • http://kosumepifise.pbworks.com/w/file/fetch/144933462/apa_writing_style_7th_edition.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/f/36041662293.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_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 5548 bytes
SHA-256: f5c60dfebbfdec893f40927b0e8b08739a144f384c41e9ebac70849fa2fad060
font_01_sfnt_off0000f8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 10248 bytes
SHA-256: 697e223a3f141e049a597e53e86f635488d5d30dd604a252926e6f21ee279b98