Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab13af2c13912c1…

MALICIOUS

PDF

75.4 KB Created: 2021-03-06 12:06:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8a51c75ec5beb6b254fa3c446fbd285b SHA-1: a927e3ee0eb1f050a1ae6b8907a49f6448534a8e SHA-256: 7ab13af2c13912c104037d5a385cb3e8deb48ab50c1aa6a0cf031b8381e5bfa2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://gimoguvi.ru/123?utm_term=ventajas+e+inconvenientes+del+aprendizaje+basado+en+proyectos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370785/normal_601f7f2e431cb.pdfIn PDF document text
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/kebinofude.pdfIn PDF document text
    • http://precabinets.xyz/gantt_diagram_template_excelzxs5o.pdfIn PDF document text
    • http://lunesygets.xyz/how_to_set_a_skyscan_atomic_clock_model_86730z4rj2.pdfIn PDF document text
    • https://raziliselew.weebly.com/uploads/1/3/2/6/132695443/febakidusupex_xumamotoronesuw_zirisosutujirut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482230/normal_5feb78582720b.pdfIn PDF document text
    • http://deladinabixek.sportsontheweb.net/red_dapple_dachshund.pdfIn PDF document text
    • http://sweetygirl.club/osteoporosis_australia_calcium0jrse.pdfIn PDF document text
    • http://japuxivofag.22web.org/93985812250.pdfIn PDF document text
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/6be87375caea.pdfIn PDF document text
    • http://newsportstechnology.ru/rujepajalofewebikowerolap98gh5.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/92533554938.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459794/normal_5fddf38c87d92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465400/normal_601a2a0b42b1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_5fe70748841e2.pdfIn PDF document text
    • https://makigutezun.weebly.com/uploads/1/3/4/7/134707077/raxaraguput-wulux-tonijoginaroga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/606df704-fb75-4ec4-8944-52d041cad25f/how_to_connect_playstation_gold_headset.pdfIn PDF document text
    • http://fukikofopoz.rf.gd/toro_ccr_2000e_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19318198-4641-4d06-8ecf-c0d5bf7e3efd/lazojiburoneluzokinabi.pdfIn PDF document text
    • http://modewomidoxiva.epizy.com/solving_quadratic_equations_all_methods_worksheet_tes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 5248 bytes
SHA-256: 66589966dc5cdbdd50f82d1914739116c5878aa6bbea9b65075bc34dc1e1d14e
font_01_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 10848 bytes
SHA-256: a09c4a5202392f18b647ad8c2e6d2c66574b4cf900049dd661be2d1086705e61
font_02_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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