Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a6e74d70c9c624…

MALICIOUS

PDF

68.5 KB Created: 2020-11-23 19:30:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c9c88889d2f39ee6c89ec10f15209f3e SHA-1: 17712bd4483476ae0ae76dae6556768495383989 SHA-256: a1a6e74d70c9c624a78653be31ac9ec482a9efa627295405e4fc6562fda19811
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, with a primary suspicious URL pointing to 'traffset.ru'. The PDF structure also indicates a link farm, suggesting an attempt to redirect users to potentially harmful content or facilitate further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffset.ru/strik?utm_term=mishkin+11th+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419654/normal_5fb5b17c5d163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_5fa0e24a59842.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/wabipudetekubegebel.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/b9404d07-538e-412b-b78e-b9b6293b48e7/kibetusipapigujigijan.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/64795989524.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/burton_malkiel_a_random_walk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fbf7f6c-bfe1-4d52-a251-94ef4f7627ee/tumawejoxofemakojefab.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/verizon_jetpack_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/outlook_app_for_windows_10_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bae9cc4-ad9c-440f-9b57-4eb97215d289/berugiwonasewiredidoriti.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/tamil_album_songs_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/mazig.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_off0000d0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E9 4912 bytes
SHA-256: ce29c3b6ce8d0909aef041ef1044076682fae3a9bb8d237c6fd9c22806c06d92
font_01_sfnt_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 10464 bytes
SHA-256: f3f9ace75aaedba9baaeadf4fbf87bcf640a99a04eb7906712cd25665912fc25

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