Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a91b9dfba0e414…

MALICIOUS

PDF

77.9 KB Created: 2021-03-22 20:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8a0316a1cc3a4c3ab557f1909b9d69f8 SHA-1: 58d696e1f3d89de7ba95339d40427f427edea0e6 SHA-256: 52a91b9dfba0e414822083fd837fe2d91cdd9af7a70b2c4a042dfc4ab16e64bd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/wix?keyword=water+distribution+certification+study+guide PDF link annotation
    • http://dosijefa.mypressonline.com/how_much_is_a_smith_corona_electric_typewriter_worth.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415321/normal_5fd96c775fe8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387581/normal_5fdf91590dbb4.pdfIn PDF document text
    • http://pawelemofub.iblogger.org/libro_caballo_de_troya_2.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/how_to_wire_a_micro_usb.pdfIn PDF document text
    • http://cleanup-sale.site/1400_calorie_diet_plan_to_lose_weightly69z.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/bazovosesujakapiloxebi.pdfIn PDF document text
    • http://peskomment.ru/75691514991svg4s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_6009dd96acf2b.pdfIn PDF document text
    • http://stat-index-co.com/86803997673syfzk.pdfIn PDF document text
    • http://nibakelenixezas.getenjoyment.net/craftsman_yt_3000_46_deck_belt_length.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/saziwijaxodav/xotewejudomelemev.pdfIn PDF document text
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_234f0cddb1ff42418ea2726858105d62.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesijesule/kawapixadobut.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/47150060919.pdfIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_54ece55dcf254786a265cd3c26b6b3d7.pdf?index=trueIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_6970158a3eb84f1f8b1157786f3ebafe.pdf?index=trueIn PDF document text
    • http://jokosen.atwebpages.com/jenis_blanching.pdfIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_c6122ea73ccf4dad8b3fb70d039f03e6.pdf?index=trueIn PDF document text
    • http://xaduvegovoz.rf.gd/8733303844.pdfIn PDF document text
    • http://nawogov.epizy.com/hp_laserjet_p1102w_ink_cartridge_staples.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/peace_like_a_river_summary.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_off0000f0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 5412 bytes
SHA-256: 23bdd74c46d0d3b0ab86e4b0d61ebfe3abdc32e348983f3215983f2ff8a8d4ce
font_01_sfnt_off00010362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10362 10796 bytes
SHA-256: 3964ff8e2f79035a83175a199f207ba0005cf78c7a4cc0fe45fb1d7c1c5e82f4

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