Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a9baf41ae8f491…

MALICIOUS

PDF

72.4 KB Created: 2021-02-15 10:14:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 32bbd9d7da705c61010e5696389d63d4 SHA-1: 185e1216b309034dcdf5a8f187d172e9a2347bf7 SHA-256: 55a9baf41ae8f49190516fb3a8bb77904cab1299e1fb1f0ce3d267fe421ae6f8
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and document body suggest a lure related to educational content, likely to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URIs are indicative of malicious intent.

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://bologen.ru/wix?keyword=waves+light+and+sound+worksheet PDF link annotation
    • http://avbox.org/suzuki_lt250r_manual_free_downloadwbny6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495262/normal_5fe83c3e2bbdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490516/normal_5ffb9f14884ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474980/normal_6028b6956731c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444852/normal_5fecbc5bb32dd.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/dibYuJe/sling_kong._cheat_campus.pdfIn PDF document text
    • http://pop-marketplace.ru/zalidipowot6mqh.pdfIn PDF document text
    • http://faruvob.iblogger.org/kisojanixuzosabug.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/vXiajif/singing_lessons_for_adults_brisbane.pdfIn PDF document text
    • https://cdn.sqhk.co/nujizeres/ajaa7fB/hacker_murderer_online.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/bhcIGqO/bounce_tales_classic_apk.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/basketball_trick_shots_at_hometdpvy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459481/normal_600292df58ea3.pdfIn PDF document text
    • http://vknart.xyz/k_sebzeleri_boyamao138v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xugivazule.rf.gd/android_save_bitmap_to_file.pdfIn PDF document text
    • http://kukatunudivolu.epizy.com/philadelphia_airport_map.pdfIn PDF document text
    • http://bewojux.epizy.com/vokanuwalim.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_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 5316 bytes
SHA-256: 6a0d2809c85769d73fea1c8f4152d459d123f83d65ac2a8d16d2cdf97387a7b6
font_01_sfnt_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 10964 bytes
SHA-256: 8086e0dfcec99bf155bea90645cfb854bce5a02b0f777a22560e12528235c3c4

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