Malicious PDF — malware analysis report

Static analysis result for SHA-256 da07999ab70db458…

MALICIOUS

PDF

76.9 KB Created: 2021-03-10 05:32:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 37d9733d363b640724b81ceff09562b9 SHA-1: fe01d6ab1153993390acf9c975ba6a34c7f09831 SHA-256: da07999ab70db4583c1ee370996d913d761a1b3ec8e105ab0b9461c68647dc76
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were extracted, the presence of embedded URLs and the overall structure point towards a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/strik?utm_term=washington+football+team+2018+draft PDF link annotation
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/vojav.pdfIn PDF document text
    • http://vamoktin.ru/ulcerative_colitis_treatment_guidelines_canadal3yfp.pdfIn PDF document text
    • http://lnstagram-badge-verification.com/narunefipumumekijopi1q2pk.pdfIn PDF document text
    • http://procripton.com/how_to_clean_diono_radian_rxtnie8t.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/hp_deskjet_f4580_ink_sainsburys8ryr5.pdfIn PDF document text
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/1904406.pdfIn PDF document text
    • http://armlur.space/58109521241k5k2k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c448b62-0ce5-4a3d-8d5b-68121f4ad44a/fipitugalivusuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd09e839-aed0-44b0-940d-7cc7e1f313c5/sobikanorazofaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63743660-0e9e-4f03-b15a-7795df1fdb65/5346402137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b40e9b72-7cd1-4d90-b9c0-589c011d5673/36954393729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b329a0bc-9d92-4917-a276-b74774804057/judowil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5ba22d-441f-4fad-abf3-247416e3fd9e/9605575492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46df8a83-9c97-4c1f-940d-a462bb4fe249/zididirewunomukaxaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa5545bb-9b24-4828-ac75-cb91f31f89ed/750609498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad13ea7f-3822-4426-94a1-5a2b9a2135ff/project_management_software_meaning.pdfIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_98cfc03256e2421880708a6ae6454679.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6236c13d-933e-48ad-90fd-51a44f9fee85/andy_burrows_reasons_to_stay_alive_review.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_5e55dace0e6a47518b974774a43e9872.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_5bc14051543b4fe89da0e115099d0308.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_064dad7e179040a5b30adeb851d13bf0.pdf?index=trueIn 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_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 5996 bytes
SHA-256: 85107a2f41f74f945487f51548abc5798af52429e1e1025f3a5e224b3cd2af16
font_01_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 10856 bytes
SHA-256: a0b1fdc39ce9923ac2a737b8bf99e1326aca50f7099bf881ab26b1991ffa7df6