Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d96e57de0046f4…

MALICIOUS

PDF

68.1 KB Created: 2020-11-18 16:05:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d0a6048530655d1ed733f175162b5d1 SHA-1: 1d6939ef385ff6be960cada05317ca72390acce8 SHA-256: 36d96e57de0046f4ba365e6172b9cc8e1e4fd00ceff907183b45fa25180835a1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate maliciousness, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/123?utm_term=chapter+8+rational+and+radical+functions+answers
    • https://sejejuno.weebly.com/uploads/1/3/4/4/134447194/zejixo.pdf
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/fc0118f0f941f3.pdf
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/37b38e982360.pdf
    • https://vebaruroximowut.weebly.com/uploads/1/3/4/3/134342498/zivuki_febaxoduwuvosas_mivamuta.pdf
    • https://pegebitejujag.weebly.com/uploads/1/3/4/4/134445458/26afbc8a.pdf
    • https://xujebope.weebly.com/uploads/1/3/4/0/134018561/fefedir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/df5709ad-cddb-456f-bf90-7ba710509ec0/papamujujofizip.pdf
    • https://uploads.strikinglycdn.com/files/d8b477ea-00d0-4b9f-8cc2-df714e54c11e/avatar_last_airbender_torrent.pdf
    • https://uploads.strikinglycdn.com/files/bda591e5-c12f-43b6-babb-6abed69cffb6/98732584256.pdf
    • https://uploads.strikinglycdn.com/files/b73bc92f-03a0-4524-bda5-ed88c65ece27/pavement_in_the_mouth_a_desert_live.pdf
    • https://uploads.strikinglycdn.com/files/0259d424-cd24-4b0b-ab38-f99c1444c33f/download_freeairbrush_step_by_step.pdf
    • https://uploads.strikinglycdn.com/files/5a6e5508-8d7f-420a-8f00-eb2d6ff42b58/martial_arts_manual.pdf
    • https://uploads.strikinglycdn.com/files/2fde6cc6-90ae-4282-86f4-f3b6edbad76d/fatifepeloxuneju.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccb4.bin
11b26402c221b6a710a46481548ce605fc71e56465bf0cdaf8ae6f95510361b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB4 5436 bytes
font_01_sfnt_off0000df34.bin
7d2ff5c08b060dbeeab6e0de6ac479bf88bd122f22fb14fdc9be8faf862591b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 10472 bytes