Malicious PDF — malware analysis report

Static analysis result for SHA-256 01bffe6a04981598…

MALICIOUS

PDF

78.3 KB Created: 2021-02-20 09:08:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 629addce5139d3e69c1eae75f93a0f96 SHA-1: cc1007d63b775a7e447babfe78d5901d4bb67132 SHA-256: 01bffe6a04981598dad5364e867f267b7466ef77f32bb1ee83a7e62f80bb99f3
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs pointing to link farms hosted on disposable domains. The document body, though heavily obfuscated, suggests a lure related to educational content, likely to drive traffic to these malicious sites. No scripts were extracted, but the presence of multiple external links and the link farm heuristic strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=triangle+congruence+mixed+practice+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470703/normal_5fe44620155db.pdfIn PDF document text
    • http://xtreme-sport.ru/tamil_all_songsoj5er.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486743/normal_5ff01d3c62148.pdfIn PDF document text
    • http://fortuneo-enligne.com/slaves_to_darkness_underworlds_warbandzzqik.pdfIn PDF document text
    • http://sun-italy.space/41164230071zeck2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365659/normal_5fc64be88fa1f.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/jchajgE/gtr_traffic_rivals_mod.pdfIn PDF document text
    • http://copyrights-notices-helps.com/jegevawolebexovizooftlh.pdfIn PDF document text
    • http://help-copyrighteamservice.com/plantas_endemicas_del_peruipcez.pdfIn PDF document text
    • https://cdn.sqhk.co/falupuvevore/gfif6ji/paint_by_numbers_meaning.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/myanmar_tourism_statistics_2020tlrmn.pdfIn PDF document text
    • http://jilet2.club/japeliteduxobukapatavodv8e7m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://manuzuwefegovev.epizy.com/xodegalusiwelinufu.pdfIn PDF document text
    • http://segalufosirinep.epizy.com/tilumuza.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 5500 bytes
SHA-256: 6d9057a3d447a668a3272623f36e5b6d28f8bb06990a33974496ac3c1739458f
font_01_sfnt_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 10308 bytes
SHA-256: c0b91c09a10b1fbea9b429323818bd58dbd784b1bd1cf00de7f4184aff3c24a7
font_02_sfnt_off00011717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 16072 bytes
SHA-256: ab6a2d92c6195441154fe03e3add47570783810922a3b82dfc3833ffb97f5f96

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