Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca32860b3736dd3…

MALICIOUS

PDF

79.6 KB Created: 2021-03-18 23:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c5d8318325fc06875f91e31a2cbb1775 SHA-1: 1de1a59d07013bb4da4ec38dd47e9cfca097cd5d SHA-256: eca32860b3736dd38cfbb0cf89c48436590a199382785e18b6a7d21c8616319b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism to malicious sites. The document body, though heavily obfuscated, contains references to 'study guide' and 'pdf', aligning with the lure of providing a document. The presence of external URIs and the overall structure indicate an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=the+road+study+guide+pdf PDF link annotation
    • https://kivisazof.weebly.com/uploads/1/3/2/6/132696558/kexotexil_fifagaxexafu.pdfIn PDF document text
    • https://cdn.sqhk.co/legusovej/hdjiijw/47808786878.pdfIn PDF document text
    • http://burrrhey.tech/zugagekawizekorussgyk3.pdfIn PDF document text
    • https://polemezal.weebly.com/uploads/1/3/1/4/131452876/7406629.pdfIn PDF document text
    • http://fruittea.space/buromobivemenj9g4h.pdfIn PDF document text
    • http://fimewot.xyz/is_personnel_plural2koxc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460460/normal_5fc8face017e1.pdfIn PDF document text
    • http://svoydvalend.xyz/best_photo_collage_video_maker_appa0gzw.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/juzavifoloxiregule.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/fawigajitamibujefimiwasiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_603e7390468f7.pdfIn PDF document text
    • http://xevedudox.sportsontheweb.net/how_do_you_play_speech_breaker.pdfIn PDF document text
    • https://rigupanikoma.weebly.com/uploads/1/3/5/2/135297472/zilim_bovomi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472494/normal_5fecefba8e864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_5fd937ecc9f9f.pdfIn PDF document text
    • https://mezamavizasiv.weebly.com/uploads/1/3/5/3/135312133/feponox.pdfIn PDF document text
    • http://gibafafe.22web.org/katediwapoxudakirazunap.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/865291716.pdfIn PDF document text
    • http://towudunef.22web.org/roland_td_11_windows_driver.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/eiglPha/no_le_dice_meaning_in_spanish.pdfIn PDF document text
    • http://btsworld.org/boravuqk10p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://watejejopu.epizy.com/d_and_d_auto_group.pdfIn PDF document text
    • http://rajixubododafu.epizy.com/68306253738.pdfIn PDF document text
    • http://gobunapuvifug.epizy.com/google_maps_api_examples.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 5096 bytes
SHA-256: 8cd04382647c005d9e20d097d625b56d00f81c02509055f7adffb0e1ed473eaf
font_01_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 11232 bytes
SHA-256: f20009b209346e2f9ebbda2b9d729265b7d22776607663411c456adae8d9cf65
font_02_sfnt_off0001216d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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