Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd564d86f80d839…

MALICIOUS

PDF

78.4 KB Created: 2021-02-14 12:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 80a76873217914dfa7700959c7d1b2e2 SHA-1: abdb9f2c30fff1cdd885eed68e98020d74329356 SHA-256: 7fd564d86f80d839887ffc692fc27cd6ffef06ff79c843ccee83602c7b037747
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'instrucciones no incluidas', hinting at a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/wix?keyword=instrucciones+no+incluidas+cast PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449614/normal_5fd2e32733065.pdfIn PDF document text
    • http://ecosbor.net/facebook_video_to_computer4y3ld.pdfIn PDF document text
    • http://ouily.xyz/cnet_logo_freen3mp4.pdfIn PDF document text
    • https://vizejuvevu.weebly.com/uploads/1/3/2/6/132681979/ce925cc4387b4b.pdfIn PDF document text
    • http://baby-slings.ru/class_12th_sociology_notesoyekr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5ff46d732726a.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/817112668f881.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/fYZya6Z/29935681304.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/1b3jaif/jukalerezabevawep.pdfIn PDF document text
    • https://ragajepegoxi.weebly.com/uploads/1/3/1/3/131379061/josuzixivozu_botetumat.pdfIn PDF document text
    • http://m-laskin.ru/36614567253v5am4.pdfIn PDF document text
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/jenetolubumovu.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/ih0kgjF/asteroid_amount_space_engineers.pdfIn PDF document text
    • http://reduslim-officialsite.site/pathfinder_druid_archetype_guider7lnd.pdfIn PDF document text
    • http://genusttwsr.fun/192219873165fkel.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/hcbqiih/retro_boxing_poster.pdfIn PDF document text
    • http://intereriia.com/bombay_company_richmondx2t4d.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
    • https://s3.amazonaws.com/datarofapakil/rekek.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/14882440400.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/49281137835.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_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 4752 bytes
SHA-256: 04885229fb111436ed54379500ad97f2b3288858f06c038d8c6eb49a49226cc8
font_01_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 11384 bytes
SHA-256: dd22c07af00930e520eaccdde0083f985c688f9a158b30ffd71d6dec336bac32
font_02_sfnt_off00011c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C48 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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