Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7721053828ba4b…

MALICIOUS

PDF

78.5 KB Created: 2021-03-28 16:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9a8b555b41a932c3df7b8b96eceb6e50 SHA-1: b73ac43d4f6de18ae27971b2f062a2699847a198 SHA-256: 5d7721053828ba4bfaab828e018440bd38efecd100dc4cfc2412434ed4e3f161
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URIs, many of which point to disposable hosting or redirectors, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to 'English grammar test with answers free download', which is likely a pretext to disguise the malicious nature of the embedded links.

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://golowaki.ru/strik?utm_term=english+grammar+test+with+answers+free+download PDF link annotation
    • http://complerbnp.com/beep_sound_effect_mp47tpsf.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/Wibnkjc/asana_careers_singapore.pdfIn PDF document text
    • http://hh666o.site/simple_budget_template_google_sheets94tbd.pdfIn PDF document text
    • https://gupebaxederor.weebly.com/uploads/1/3/4/6/134691072/xitazonoj-pajareribifukex.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/vgMomhb/lomakuf.pdfIn PDF document text
    • https://jomupalekiloja.weebly.com/uploads/1/3/4/3/134310494/wesabubajupafegem.pdfIn PDF document text
    • https://duburidam.weebly.com/uploads/1/3/1/8/131856040/duxanuzigov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451375/normal_5fdebb79026b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485702/normal_60413a5b9d007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474987/normal_60177f5c466f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_6058c925451c7.pdfIn PDF document text
    • http://tesocoin.online/61776616017ojcpr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476577/normal_5ffc6a87db2d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dakozel.epizy.com/hot_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/bangla_dj_gana_mp4.pdfIn PDF document text
    • http://wivufaw.epizy.com/42212511914.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/lac_d_annecy_tourist_information.pdfIn PDF document text
    • http://mibexumobanoko.rf.gd/how_much_is_michael_jackson_house_worth.pdfIn PDF document text
    • http://kadorekamik.rf.gd/connecteurs_logiques_traduction_anglais.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/dell_latitude_e6410_i3_price_in_india.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_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 5372 bytes
SHA-256: a371bf2c4f4a38f7c13bc32d7eaebf09898a579f3fcf8be3616c255ba365be37
font_01_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 11208 bytes
SHA-256: aefb22364f9140233af7f4fb1077aa644013ce4053f7dcee37854edc45d1892b

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