Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d42d1b095788938…

MALICIOUS

PDF

75.1 KB Created: 2021-02-22 19:52:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: cce2635165246d7d81b9e5c6b1c9df5e SHA-1: 27c5f88e5051eb3f76ff2cc85fba4f028d56cc4f SHA-256: 1d42d1b0957889382fb0278f6209ea9e0e5c2b99e9f0fb70add0590e5fabd825
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely used for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=what+is+a+pedal+power+supply PDF link annotation
    • https://cdn.sqhk.co/titabofasika/gfE6ujb/69600965679.pdfIn PDF document text
    • https://cdn.sqhk.co/zebapomiz/phiQdie/tie_dye_hoodie_and_sweatpants_set_fashion_nova.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/fig81q6/besupogimo.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/hgijNFx/kingdom_come_deliverance_thief_reputation.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/TiewCia/69340111106.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/dSXwAij/telugu_bhakti_ringtone_songs_free_download.pdfIn PDF document text
    • https://fusavufotopos.weebly.com/uploads/1/3/4/6/134634064/webegatenazugugo.pdfIn PDF document text
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/bewimavurofuto.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/iipehaN/61951478839.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/jFJhdgc/vivakibub.pdfIn PDF document text
    • https://cdn.sqhk.co/kopenanum/C6gfFgf/ludirilakewubifarenutas.pdfIn PDF document text
    • http://canonsburglake.org/new_holland_lx885_repair_manualc0ims.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/bobajow.pdfIn PDF document text
    • https://rirusiwox.weebly.com/uploads/1/3/4/2/134265342/6773923.pdfIn PDF document text
    • https://lebotowim.weebly.com/uploads/1/3/1/4/131438344/siperukarozubuv_zuwugamagup.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/dukavunivifa/97612438048.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/23432907206.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/entrepreneurship_theory_and_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/time_warner_cable_box_guide.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_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 5252 bytes
SHA-256: 06398138d57cda72c01df2289949e688b1afd6d20a21f2578dc3bcefe7903240
font_01_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 10388 bytes
SHA-256: 07dc06bde527d5a25f1d19b101a6e1acb62c6f415cb5afff24a8cf576af743b0

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