Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b9acb49a579fee…

MALICIOUS

PDF

76.4 KB Created: 2021-03-28 22:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6fec2ae25c7ebe09807dee77774cb2a5 SHA-1: 1287c595a83bb5fbfc24212b57ec24bae61b9f6b SHA-256: b6b9acb49a579fee860043e7dc55d3139fc427e1bbb787187936bf21c6b28db5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to search terms, further supporting a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=tuesdays+with+morrie+quotes+about+family PDF link annotation
    • https://cdn.sqhk.co/zidulibu/iuEicSZ/impulse_response_function_formula.pdfIn PDF document text
    • https://samivixawudajan.weebly.com/uploads/1/3/4/6/134634686/toxekevu-bulikerababuni.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/88325717961.pdfIn PDF document text
    • https://dizogesutupini.weebly.com/uploads/1/3/4/6/134631076/vebolelof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383912/normal_5fde907e36fa3.pdfIn PDF document text
    • http://bomisedoxu.mywebcommunity.org/1457709369.pdfIn PDF document text
    • https://cdn.sqhk.co/jijatidos/iRggmwD/patir.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/xamizafafev.pdfIn PDF document text
    • https://nagofojog.weebly.com/uploads/1/3/4/5/134586362/9119519.pdfIn PDF document text
    • http://sekujirimabasas.getenjoyment.net/kawuv.pdfIn PDF document text
    • https://witaretazijaw.weebly.com/uploads/1/3/0/8/130813730/bewezewalipivutir.pdfIn PDF document text
    • http://nipijapogila.sportsontheweb.net/bordereau_de_paiement_cnss_et_amo._maroc.pdfIn PDF document text
    • http://xikisavi.scienceontheweb.net/25077491484.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/ijdiwHH/soapstone_incense_burner.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460071/normal_5fef187f059e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_601f94d2c9e59.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/xetasif/apple_earnings_report_history.pdfIn PDF document text
    • http://pabotojixupi.atwebpages.com/english_grammar_in_use_elementary_level_test.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/big_buddy_heater_near_me.pdfIn PDF document text
    • http://vunonam.atwebpages.com/encyclopdie_des_plantes_mdicinales_andrew_chevallier.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_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 5556 bytes
SHA-256: 5a11d59018d5ef45861cf0c0a13929ca99e2a1395ff278c9b1f46622799784ab
font_01_sfnt_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 10944 bytes
SHA-256: e54a86440d089076a2b01bd4064f958bc1791dd51ef3fc15b0a3f0e22f76e9cc

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