Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9e7fe0e9265593…

MALICIOUS

PDF

80.5 KB Created: 2021-03-11 15:30:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8f813d44fb741acec6fde94cdbc2d86d SHA-1: dc938c42425a51fbfb5aa29e3bb379186bba56ab SHA-256: 9d9e7fe0e9265593e9bfdc1f029933a31fcce5664e12d485ece1dcb14df7bbfe
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, specifically as a phishing trojan. It contains multiple external URIs, including one on a disposable hosting domain, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to contain keywords related to medical procedures, likely as a lure to disguise the malicious intent of directing users to untrusted websites.

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://gimoguvi.ru/award?keyword=coronary+artery+bypass+grafting+procedure+pdf PDF link annotation
    • http://bavedibigilomit.66ghz.com/35319597770.pdfIn PDF document text
    • https://jozevupipe.weebly.com/uploads/1/3/5/3/135346753/f5081965e8df1.pdfIn PDF document text
    • http://gonakasuzoze.22web.org/which_of_the_following_statements_is_true_about_cost_behavior_patterns_within_the_relevant_range.pdfIn PDF document text
    • http://davufemalolaj.iblogger.org/bang_bang_video_song_in_1080p.pdfIn PDF document text
    • http://vosalax.22web.org/ap_polycet_hall_ticket_2018_manabadi.pdfIn PDF document text
    • https://fusewexe.weebly.com/uploads/1/3/2/7/132712136/259af34c.pdfIn PDF document text
    • http://wiwomadexuza.22web.org/jeruvoxisaguw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/46759436235.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/koparob.pdfIn PDF document text
    • http://rokodejufoda.rf.gd/poulan_chainsaw_p3314_parts_list.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/malayalam_calendar_may_2018.pdfIn PDF document text
    • http://guligakifiw.epizy.com/what_are_the_key_principles_of_sociocultural_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6528d77-b809-4aac-be3b-5c4a4054d0cf/koniridobetazazojizitolo.pdfIn PDF document text
    • http://povalimokuwov.rf.gd/78910217314.pdfIn PDF document text
    • http://filivuso.rf.gd/tablet_rca_voyager_pro_7_caracteristicas.pdfIn PDF document text
    • http://xifedesekelogu.epizy.com/zujitagibar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c77a4b40-a39e-4978-8515-e58c9f0e9fed/61336916322.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 5436 bytes
SHA-256: ce9142e0f638c1fdcd2eb51d92d212bda9539d8adaafd7f975ced07cf2ea0d24
font_01_sfnt_off000110a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 10640 bytes
SHA-256: 9e398cc8868377fc66d5bfe31e4fd65989b2cdab309dc056544816cb20a53a04

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