Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6480e2b145a968f…

MALICIOUS

PDF

73.9 KB Created: 2021-06-11 06:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b0857aaea549f5c1534198e15f280601 SHA-1: aa0baddeeb54f8b3e29a1e0b9474d85a141f16c7 SHA-256: c6480e2b145a968f7e56b77db19be837a406874fcaf814702015a9c375db6ae1
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to relate to PDF size reduction, a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/pbw?utm_term=reduce+pdf+online+to+100kb PDF link annotation
    • https://rurinigumiza.weebly.com/uploads/1/3/5/3/135350695/c8d4b091af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470028/normal_6043e0a75e27a.pdfIn PDF document text
    • https://gedorizifoxe.weebly.com/uploads/1/3/1/6/131607240/rarifuguxet-vuveli.pdfIn PDF document text
    • https://zowololo.weebly.com/uploads/1/3/5/2/135294949/555bfe9904f51f.pdfIn PDF document text
    • https://noxojinuk.weebly.com/uploads/1/3/4/4/134479051/vogalemexitabum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422628/normal_60698156249da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455672/normal_6040d918c4297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_605c50255af9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464072/normal_604d78fa3fd8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5fc610edc115e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408001/normal_6043bba9badc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393208/normal_603775b46b08d.pdfIn PDF document text
    • https://lawukexudemodu.weebly.com/uploads/1/3/4/0/134041757/1650075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531523/normal_5fcaa90945511.pdfIn PDF document text
    • https://zabutamudosuwox.weebly.com/uploads/1/3/5/3/135345211/bizigo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387712/normal_5fe01b252fd77.pdfIn PDF document text
    • https://kezugefoluvero.weebly.com/uploads/1/3/1/8/131856244/xakazejebag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_5fe8bd0f38746.pdfIn PDF document text
    • https://kenomipijisax.weebly.com/uploads/1/3/3/9/133986884/favisomudip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_6017bcc47a689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475719/normal_60433a0b3cb30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501479/normal_6022418cee2c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4798f008-eb85-49f4-a434-cd8f84cf773b/50033986305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df21ba5-3582-40f3-9f15-d9ff8e0f3a97/51523288912.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_off0000e102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE102 5068 bytes
SHA-256: 9b7f147737df524a78b8ae68310445c964e2033662d741a69f46640bb8b9a3e7
font_01_sfnt_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 12064 bytes
SHA-256: 19270f21d84da686da3379d91f35a5fd10e463e78176df760bfe45d9bea56732