Malicious PDF — malware analysis report

Static analysis result for SHA-256 c193b1a41980b22f…

MALICIOUS

PDF

144.0 KB Created: 2020-12-22 16:58:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 82e02772a0234256c64765ca476817e9 SHA-1: 9b816b58063d456ddcf4b46bc627233e33bee4bf SHA-256: c193b1a41980b22f1766ba43f80cd854b7962a094ae79e5a5fce2ae059f3fd23
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=germany+world+cup+2014+group+stage PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390638/normal_5fb860ed3e6ce.pdfIn PDF document text
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/7283624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_5f987f233f48a.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/vemifotojufigituk.pdfIn PDF document text
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/18fe123.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fce547a90e5b06becb6a36f/t/5fcfd7f251e8cf16f0831be8/1607456754371/black_beauty_1994_movie.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe03c5e3f59a2572da1ccfa/t/5fe0960091828d0f5d79f7db/1608553985441/popixotojomelopugi.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/6988613398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c2d9c3-da79-42a4-b11e-b3d1536f292e/78751845424.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc9bbe50f46d6500014148/t/5fdcd67d6c7f660c89f479bd/1608308350429/10263719552.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3a01a8ef7301f8b21e4b4/t/5fd219d1071bbc6880322fe2/1607604690879/80427845178.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD4E 6032 bytes
SHA-256: a48b742ea422fca72c0d64e632612ebd3f2be1e0fefd9c36401f8f7fcf4761ac
font_01_sfnt_off0001e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1DD 2248 bytes
SHA-256: 8b88185fb1caa19b127db774f1e773b8ec41d1394bc7b72cd727186061f48d9d
font_02_sfnt_off0001ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC30 19008 bytes
SHA-256: d4622057bec7111547d57244227ce90d4270dcd987df1a8ed1831a15eb02512c
font_03_sfnt_off0002229a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2229A 6276 bytes
SHA-256: b20a2dfda06631a8ca6a8ffb6ff6c2427330c12e1e31f56a4b8858a8f8c9173d

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