Malicious PDF — malware analysis report

Static analysis result for SHA-256 94cd3e13152805bf…

MALICIOUS

PDF

71.7 KB Created: 2020-11-23 06:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72c9f9511b800788c8de616661254385 SHA-1: 7af21d99f6d069f9c7e3cb2e1e3d6e85caba498c SHA-256: 94cd3e13152805bf1ab8312d20f822ee0d28407cb803518187f572a8bd29c409
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with one prominent URL pointing to 'trafftec.ru'. ClamAV also detected this as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'. The presence of embedded URLs and the ML classifier's high confidence score suggest a malicious intent, likely related to phishing or distributing other malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/aws?utm_term=ashampoo+photo+optimizer
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/ridox.pdf
    • https://rawudirujitasep.weebly.com/uploads/1/3/4/5/134588445/5343070.pdf
    • https://xiwitewikilimav.weebly.com/uploads/1/3/4/3/134371529/b6339643dee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/9ca44f34-d9d0-40ca-abf9-5d2128eff723/nozowum.pdf
    • https://uploads.strikinglycdn.com/files/a1624280-3fad-4675-94f5-14838a6541a2/kevaguj.pdf
    • https://uploads.strikinglycdn.com/files/5cabdac4-49bb-4824-b58d-fc0888aa754a/48586731353.pdf
    • https://uploads.strikinglycdn.com/files/fc751275-11b1-4eac-859a-1149963406e0/9504139128.pdf
    • https://s3.amazonaws.com/patotale/velapofatorurot.pdf
    • https://s3.amazonaws.com/baxegezivumi/surah_al_fajr_bikin_nangis.pdf
    • https://uploads.strikinglycdn.com/files/b52354c1-46b7-4cf1-82ba-58d79b0dcbbd/vamuxuditifadulebas.pdf
    • https://uploads.strikinglycdn.com/files/9774bd7f-6bff-4dad-b420-c297936162a2/titurewedizovimitorigiv.pdf
    • https://uploads.strikinglycdn.com/files/a0c9d66e-92e6-41b7-9e75-d747575dd8bc/pulaxupos.pdf
    • https://uploads.strikinglycdn.com/files/567f0202-2873-45a1-8267-475400d2f3eb/44995234013.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d25a.bin
e32d459828e562f6a6e4b27c7ae6a1beae75db250644bcf9cde2cb12db904906		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 4748 bytes
font_01_sfnt_off0000e275.bin
5168c18769e5a48f3fe06058d92106f32ffe66eb1ce3db2585433f8df64bcafc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 9912 bytes
font_02_sfnt_off0001044b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 4324 bytes

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