Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b4a7fd022f225d…

MALICIOUS

PDF

84.7 KB Created: 2021-03-28 10:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 443c681d2e96fce7d17465c6d12d361a SHA-1: 0a1650153211bfaea726a0d34a1bcc6fd1a6f540 SHA-256: 52b4a7fd022f225d6a6ba2740da9adeeb1cb352403e3c82d1f46abf3d29631e8
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable or suspicious domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a lure related to academic topics, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/award?keyword=advantages+and+disadvantages+of+behaviourism+in+the+classroom+pdf PDF link annotation
    • https://cdn.sqhk.co/wejawujagi/bHhggfq/woxideminizonupaka.pdfIn PDF document text
    • http://remeik.ru/95900073881nxnuk.pdfIn PDF document text
    • http://waneboto.66ghz.com/32866688826.pdfIn PDF document text
    • http://unonatur.space/150059083522brfp.pdfIn PDF document text
    • http://getsalle.xyz/1747161168059ayu.pdfIn PDF document text
    • http://antinomi.design/41851525211mi3en.pdfIn PDF document text
    • http://opencabinets.xyz/walmart_brand_guidelines_20194yo2c.pdfIn PDF document text
    • http://gta-msk.ru/do_you_eat_carbs_on_keto_dietc9vtv.pdfIn PDF document text
    • http://limecash.xyz/towugasobifinebarek4p1q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_604cb2d3a25c4.pdfIn PDF document text
    • https://cdn.sqhk.co/dosiloxof/iJggicL/basketball_shot_return.pdfIn PDF document text
    • http://instapriz365.site/setup_flysky_fs-i6xgbtdz.pdfIn PDF document text
    • http://leadtop.co/fivabamllji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463552/normal_5fe6d6f010bec.pdfIn PDF document text
    • http://esclub.pro/fokewabofomegenorvgtt.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/Kgdgdea/download_game_flip_diving_mod_apk_revdl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489586/normal_5fd08dc11cbf6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dirunexodov.rf.gd/kathi_sandai_songs_in_starmusiq.pdfIn PDF document text
    • http://takodibunogudas.epizy.com/rewetunupiwoje.pdfIn PDF document text
    • http://vaxasevon.epizy.com/gajididila.pdfIn PDF document text
    • http://dusujelad.rf.gd/40104223693.pdfIn PDF document text
    • http://pemadewuxifanu.epizy.com/nenusilekuxerozuluxaset.pdfIn PDF document text
    • http://nakulugexogi.rf.gd/amphigorey_also.pdfIn PDF document text
    • http://molutuganum.epizy.com/18997497681.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_off00010b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 5756 bytes
SHA-256: a18091dc0655cf051489f3722bfb4387793f8d1e4edd60c5364a08a4b1d17da5
font_01_sfnt_off00011e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E95 11456 bytes
SHA-256: 986b8c82a8ae55aefd6325fc7da37557aa23901b62b098a63d83bc00cc441961

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