Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aab0d5c91fcccd4…

MALICIOUS

PDF

78.8 KB Created: 2021-06-08 10:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 739e2f3755f5de245564f7762d6aa0be SHA-1: e7fe8ce6f7a12187b38f5a69fd3672018ec20e32 SHA-256: 6aab0d5c91fcccd4a4b16e2463d87f9e6135b645d2a9b12c41a9e2372619fe9f
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristic firings indicating it is a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely a phishing lure for an audiobook download. No scripts were extracted, but the PDF structure and external links point to a social engineering attack.

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://smidgel.ru/pbw?utm_term=how+to+be+3+man+audiobook+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481154/normal_5feee0e65d225.pdfIn PDF document text
    • https://wexaluzeneroxer.weebly.com/uploads/1/3/0/7/130776054/vonoz_julegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_60bdf27580935.pdfIn PDF document text
    • https://povijovo.weebly.com/uploads/1/3/4/4/134463476/weruv.pdfIn PDF document text
    • https://rezomiwutamanap.weebly.com/uploads/1/3/4/3/134362688/359488.pdfIn PDF document text
    • https://kepoxenuranejes.weebly.com/uploads/1/3/4/3/134396716/jelenaduwezejevuna.pdfIn PDF document text
    • https://talonira.weebly.com/uploads/1/3/4/8/134895983/6934079.pdfIn PDF document text
    • https://wujumumokujot.weebly.com/uploads/1/3/4/6/134613036/672032.pdfIn PDF document text
    • https://xijofufakeziti.weebly.com/uploads/1/3/1/3/131380729/1967911.pdfIn PDF document text
    • https://lijowuvum.weebly.com/uploads/1/3/4/6/134624244/f79101a025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426410/normal_6064a28c9330e.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/f7705ccd-060d-48d2-95a4-f14f96527698/verbos_irregulares_em_ingles_lista_completa.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144461640/64391062310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49ee92c4-78c5-4cdd-90df-c8359b16d4f2/23771139283.pdfIn PDF document text
    • http://duwaxifu.pbworks.com/f/82536939685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac16ed8-b475-438e-8642-7721ee9041a5/washing_machine_repair_shop_dunfermline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd4b64e-384f-4663-af1e-613d501be86f/66065787936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb051b5-e64c-4cbf-85b8-e89fd7dde24a/bernina_1008_tension_problems.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/f/rule_of_72_worksheet_dave_ramsey_answer_key.pdfIn PDF document text
    • http://gitixofipoxu.pbworks.com/f/8136369878.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_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 5000 bytes
SHA-256: 412bfd93919ffbd846e5f6038792388d9ce2ce653846f84c20dab849e58354a9
font_01_sfnt_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 10884 bytes
SHA-256: 6c2d451233993a6b0dd7d141733ce8af9c37e03948721c7e4eee01b297e42eb5
font_02_sfnt_off00011fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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