Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a38d59bae0c89f5…

MALICIOUS

PDF

77.5 KB Created: 2021-02-05 12:46:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3c967eac86702d2dd39aaaa86e1bfcc6 SHA-1: aa308ebff45af1bfdc61e3c437fb88032d8aa0a3 SHA-256: 7a38d59bae0c89f58d86701fa9eb355a7992a120ee04c33f371b6ae101aa4a29
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious content.

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://seumenha.ru/wb?keyword=mind%20games%20for%20free PDF link annotation
    • https://cdn.sqhk.co/bunewonu/0gijfP1/the_bonfire_forsaken_lands_free_ios.pdfIn PDF document text
    • http://bilokeg.iblogger.org/mechanical_engineering_mini_projects.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/cbgchip/axes._io_mod_apk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/woxiwovar/iNujjyP/video_downloader_app_for_instagram_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bavisimupux/Kijhhgg/96814668770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5fe6a280022ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_5fe7eb83dbe73.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/hfihNoY/dozomuporozakafasukibibum.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/wgchbjf/xajajuxudodebu.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/Hiciaha/islanders_roster_tonight.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_5fd65b52ccae7.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/jd0YlOO/21178303381.pdfIn PDF document text
    • https://cdn.sqhk.co/xusovatovu/jcfjagg/dawasagi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://borovob.epizy.com/android_one_power_review.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/singapore_guideline_for_good_clinical_practice.pdfIn PDF document text
    • http://jolivawojo.rf.gd/grep_guide.pdfIn PDF document text
    • http://lugirike.epizy.com/acer_aspire_4752g_driver.pdfIn PDF document text
    • http://mowubuzedolilaf.epizy.com/19835514085.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/coopervision_proclear_multifocal_fitting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/adafruit_motor_shield_v2_datasheet.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_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 5200 bytes
SHA-256: 825d22d2505eaae1729604194fd8c830deb7a919db66d86e416b325ffd9bc339
font_01_sfnt_off00010544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10544 10300 bytes
SHA-256: d1cfde83cd53b43e77cbb23e0747be3755d3a1c65ff80aeb515cd43d07c5966a

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