Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f27eb331befb8a…

MALICIOUS

PDF

114.3 KB Created: 2021-03-28 04:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e8bb4cf99fe7e8d8e59ef1fa437111a0 SHA-1: 11e6bcba5aacf18a4c733f6bfbc457ec4242fbdf SHA-256: f3f27eb331befb8ae885f7d9caecbc1766b0b6f609937399a766da73ceefcd34
186 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 0.9998

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://bologen.ru/wix?keyword=the+general+history+of+virginia+new+england+and+the+summer+isles+summary PDF link annotation
    • https://zekedijudanafow.weebly.com/uploads/1/3/0/8/130874467/12eef95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451556/normal_6051cb62ce912.pdfIn PDF document text
    • https://cdn.sqhk.co/waladoved/j4gd38w/color_jump_in_space_station.pdfIn PDF document text
    • http://lidozabanej.iblogger.org/how_to_watch_charlie_and_the_chocolate_factory.pdfIn PDF document text
    • https://rogixatig.weebly.com/uploads/1/3/5/3/135323026/1533969.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/wjjifhf/94505059950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_5fd9a35db49b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467915/normal_6059c6b444fd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444096/normal_5fe2529ab7355.pdfIn PDF document text
    • https://cdn.sqhk.co/kolusugego/RhjghYT/87712530039.pdfIn PDF document text
    • https://cdn.sqhk.co/zubixola/Xgigf3C/livova.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_b864747c0b8d49ffbfa3ccf52a771050.pdf?index=trueIn PDF document text
    • http://wuxirakagatijir.epizy.com/romantic_couple_cartoon_hd_wallpaper.pdfIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_b94a1c0af575439ea6ea336a00749261.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/a_que_edad_se_puede_trabajar_en_california.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/94428279222.pdfIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_90b557a52b4b476287308cfcb6674d74.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_75ee163fa0c64d699133e4af01e85c16.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_60471f1bc28b4f0d9e6d64249e640a90.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_off0001830e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1830E 5524 bytes
SHA-256: c4aa186ea2f6835f2adec69134d342375c765ca7a5e814c0f988c64a319c1ab5
font_01_sfnt_off000195cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195CC 10936 bytes
SHA-256: e3b71ecd33481198b800ee3077ba9f3c1f46a5d9450bbafdf6c2804318ad81ec

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