Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4fce41e1b9275d…

MALICIOUS

PDF

68.3 KB Created: 2021-03-24 07:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bd978eef240638808980c7a14c16f962 SHA-1: 1068aa2ea2b35f57a7b37a535b130b9df8e2f954 SHA-256: 9c4fce41e1b9275d3c7553177c8504004b821b07548c3d325cdb248c56a4a019
186 Risk Score

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 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/award?keyword=datasheet+download+pdf PDF link annotation
    • https://muputobiga.weebly.com/uploads/1/3/5/3/135308906/0ba153.pdfIn PDF document text
    • http://tutavizukatafoz.22web.org/36557253638.pdfIn PDF document text
    • http://japadalifu.22web.org/sekat.pdfIn PDF document text
    • https://nizakibete.weebly.com/uploads/1/3/4/3/134386075/4184806.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/c99daeaf-78c9-45b8-9123-b24b0b91582f/ballards_dirt_bike_parts__accessories.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_32d700fcc5f14b50873ed5a2f7f83d93.pdf?index=trueIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_c34d3b52dba545c4855cd3cf90a2c732.pdf?index=trueIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_3ef46747f39046ed96ffa759632f060c.pdf?index=trueIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_8ad709317d6d40958e806ed4f9cdb647.pdf?index=trueIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_4232eab38f3e4f18a3986d4085042156.pdf?index=trueIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_9fba9e2a1c9f46c786c4d744f24f8516.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf865576-7f6c-4c3f-a6b4-4c4810c93ee3/fakipekijobinugonadelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e34998-e359-496b-b3bb-b10f4ff36dd3/80810182158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/476bca70-6ffd-4a8e-ada4-66f8604217bf/why_is_my_swann_cctv_not_recording.pdfIn PDF document text
    • http://dizutobasuxolom.epizy.com/zirov.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_9e4ebe4da3834374a23bd939ba4c32d3.pdf?index=trueIn PDF document text
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_ab38693fff7a4562b2502e4fafcfe892.pdf?index=trueIn PDF document text
    • https://5f1c1209-45f6-45c0-988a-e0aaa04be055.filesusr.com/ugd/ba5820_b9212a0004e742519c3850a8b78de2ed.pdf?index=trueIn 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_off0000d044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD044 5124 bytes
SHA-256: 7321ae5f52f6c3bce5e4807a0e77b5ea838be9e8576cdd19209d2ebccd89fb77
font_01_sfnt_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 10152 bytes
SHA-256: 463fcaa351946966823162f76de53d21f95b69df61c65a64373c26f2a700b2ba