Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac11a7e3e6710f3…

MALICIOUS

PDF

73.1 KB Created: 2021-02-20 22:06:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 251cc1bfae6e4e3011d21f13c9a950ab SHA-1: 66d37e1594ca2e4e8f25881e9325b7050e827b29 SHA-256: fac11a7e3e6710f313b7ab7a767248061c152bdd6e909649491794f91fe6ec2f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to a word search recipe, which is likely a pretext to direct users to malicious sites like https://seumenha.ru/wix?keyword=sopa+de+letras+receta for phishing or malware delivery. The presence of external URIs and the overall structure indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/wix?keyword=sopa+de+letras+receta PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419001/normal_601cda7241438.pdfIn PDF document text
    • https://cdn.sqhk.co/muwesisokim/gKidrok/miweloxukitelelebuda.pdfIn PDF document text
    • http://damomemisogadex.iblogger.org/96405934205.pdfIn PDF document text
    • http://rabejagoruwobol.66ghz.com/google_chrome_thai.pdfIn PDF document text
    • https://tilifopufobi.weebly.com/uploads/1/3/6/0/136049844/garupejepuvetowuleku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496381/normal_5ff3cfae8bc1f.pdfIn PDF document text
    • http://golitibixodeku.iblogger.org/aladdin_soundtrack_2019_zip.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/7LTrBzS/the_little_ball_that_could_apk_mod.pdfIn PDF document text
    • http://fupofejoja.22web.org/90042236199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500187/normal_601292a893890.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://sasuwirakib.rf.gd/rorabebagegaji.pdfIn PDF document text
    • http://pugagewuda.rf.gd/leave_application_template_excel.pdfIn PDF document text
    • http://digegaleviverab.rf.gd/advanced_engineering_mathematics_zill_4th_edition.pdfIn PDF document text
    • http://zerekigukazaja.epizy.com/93003343096.pdfIn PDF document text
    • http://xefavab.rf.gd/wavemuvep.pdfIn PDF document text
    • http://sedexajukewuxep.epizy.com/49540738623.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_off0000c934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC934 4804 bytes
SHA-256: 5b83f7eed1c523665f6acd629a8e57831d53fbf31189f8d75eda04504d5f83da
font_01_sfnt_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 16100 bytes
SHA-256: 962fec138340ce567cb5078ec1c7aa32b4ed974795a9493d4b26d84b0a36d8d8
font_02_sfnt_off0001098a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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