Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15e37dfb018f8c0…

MALICIOUS

PDF

101.7 KB Created: 2021-03-26 20:03:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d9ffe1fe7c9f09f9988122c911447e57 SHA-1: 79df813b16450e9a11e4dacc3a930d7733cc19fe SHA-256: c15e37dfb018f8c07d590723972cec6d2c12d829ec4b97857d88984e61638582
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, presenting a deceptive lure for a 'science coursebook' to encourage downloads from numerous external URLs, many hosted on disposable domains. The primary intent appears to be directing users to potentially malicious content or phishing sites.

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://baarspo.ru/award?keyword=cambridge+checkpoint+science+coursebook+8+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/wibepudib/JbgibmQ/gikadusopulakurew.pdfIn PDF document text
    • http://mizizufiku.mywebcommunity.org/96545252982.pdfIn PDF document text
    • https://nasipowo.weebly.com/uploads/1/3/1/3/131383467/kudugogun.pdfIn PDF document text
    • https://lidanoliki.weebly.com/uploads/1/3/1/3/131380598/df16515372a.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/dypBjRx/2933667089.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/ucJjhgW/company_of_heroes_movie_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/lewonuvaxu/ijeXlia/underhand_cable_pulldown_muscles_worked.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/63JgcCT/army_wallpaper_iphone_6.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/kgehbif/cars_2021_australia.pdfIn PDF document text
    • http://misujupino.getenjoyment.net/ajaran_sesat_di_malaysia.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirijobadi/eujijfG/tomando_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ae40ec61-d20a-40a8-9c94-208d4569f534.filesusr.com/ugd/5d0862_a2670487c8494160ac41f6a30487af3f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a773c6-e806-4da5-b7fa-26d844527b83/kung_fu_panda_3_full_movie_in_hindi_dubbed_youtube.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_a6038e68747a4c4e9b2b6547b140022a.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_943dca433f344f25abe3b37628c0e9c7.pdf?index=trueIn PDF document text
    • http://mozaninukokefef.onlinewebshop.net/easy_baroque_pieces_for_classical_guitar.pdfIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_040d28d113ec4f5d8497943e4fc38c46.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aadfed3-4b4b-4901-8774-08bba1033d7e/96234021480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5356ea17-4038-491a-a0b2-31f7d040eac8/82774505810.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_off00014d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6E 5964 bytes
SHA-256: 55f4e30f72e441b20e082dc76601bf3bd448a65057326512f4b5f50843e4f2ec
font_01_sfnt_off00016198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16198 11456 bytes
SHA-256: f41387fdb41086c179f72ed6b100a3af3f89288c918c7e377e1d9ac148f10dfd

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