Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbca044dd24f27e…

MALICIOUS

PDF

75.7 KB Created: 2020-12-15 17:06:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2531c9680450b3c17e0a10b836612c57 SHA-1: 370b41f108f21d5ae8d1d7325cae60b4194afa2f SHA-256: 9fbca044dd24f27e44853aea9124d3870f6caf86d8608c4da5b00552cae38ffa
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external links suggests a link farm or phishing attempt, aiming to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=south+park+phone+destroyer+hack+android In PDF document text
    • https://vagipirisixo.weebly.com/uploads/1/3/4/8/134861957/6031536.pdfIn PDF document text
    • https://vuxarujetununo.weebly.com/uploads/1/3/4/4/134437765/zafozozatarixo.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/12754a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491433/normal_5faae8053e835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5f99422362585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454289/normal_5fa00d2b9d6f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382972/normal_5fc5f59d5ab30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407102/normal_5faac898db4d9.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
    • https://uploads.strikinglycdn.com/files/9c837ba5-f4d6-4b76-94be-59a57d62e9b7/is_it_worth_it_lyrics_jay_rock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a4552d2-95b3-486e-a23d-f27d148defbe/xeviwadigozu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57cef12facd59cecc0b9a/t/5fcea0fd866f6d0e8695a4e2/1607377149424/33370082835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dfc7154-f8ab-44ee-92f0-ad8313d56f9f/kizewimafuguv.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc37324df132613bbcddee0/t/5fc47e3afa04221c71afb21d/1606712891281/21656045841.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5db0916f6d44b07e08f00/t/5fcf4790505b451de1899420/1607419792581/50612525938.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_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 5280 bytes
SHA-256: 9bb56706cacc669cf8f6e22b4c6086bc279f8c027d07bb342f93c5f1d257b2c6
font_01_sfnt_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 11244 bytes
SHA-256: 2b6e13988e0a17220aaac9598634471cdcd9ba6b2930157d8f0b5e119df3671a
font_02_sfnt_off00011369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11369 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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