Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f507f357247b45a…

MALICIOUS

PDF

84.3 KB Created: 2021-06-03 09:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cbd0ec346f5754c5c65b99bc7e58bf86 SHA-1: 5995bba00650a00529c9e6d2bfd1af308881ff56 SHA-256: 8f507f357247b45a7ef2668801675513bccb23e9ba709dc60327f8e82dc3c6e4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/123?utm_term=software+costing+template PDF link annotation
    • https://maxijegiv.weebly.com/uploads/1/3/4/1/134131269/foxir-sagemimawodit-lulemod-vopedifazoj.pdfIn PDF document text
    • https://deserekinubolid.weebly.com/uploads/1/3/4/3/134319780/4463315.pdfIn PDF document text
    • https://vegirizixe.weebly.com/uploads/1/3/4/7/134716682/ff35020681bfab.pdfIn PDF document text
    • https://wukaxasupureje.weebly.com/uploads/1/3/4/4/134440875/7211606.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4486344/normal_60b3f3cd4fced.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/25ce953701e443c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_606609c9700c9.pdfIn PDF document text
    • https://mezamelakinates.weebly.com/uploads/1/3/5/3/135304028/kutogokabokepof_kolefiwa_roporawa.pdfIn PDF document text
    • https://getariko.weebly.com/uploads/1/3/4/9/134904460/nagel-tirekokijabitid.pdfIn PDF document text
    • https://daxeluneb.weebly.com/uploads/1/3/4/3/134324592/3431129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_603a207908fc9.pdfIn PDF document text
    • https://fepaxumezo.weebly.com/uploads/1/3/4/3/134320712/5817598.pdfIn PDF document text
    • https://fojuxiwo.weebly.com/uploads/1/3/2/6/132695505/givagapin-xovakipo-pumov-lovezuwi.pdfIn PDF document text
    • https://wazelekur.weebly.com/uploads/1/3/4/3/134322050/dosiwag.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/cd2158d3-4496-4380-b4de-d342e622b263/92752001561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82231c2d-4c27-4b70-b555-7e2736695575/binanupuluwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb4026f-2baa-46f6-b0a8-1fa0df013249/54290924089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4d98e1-2023-4032-b9c8-7dd63a6e23e5/pajutejeviluforima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/120b1fa4-5d59-4e42-a4c1-d1c1103327dc/keurig_k10_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f19540-c3b0-4186-a93d-7410a6a99a80/12777514093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9616ac81-d419-4f0c-a640-9fd1885e681d/chamberlain_whisper_drive_wall_control_not_working.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_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 5320 bytes
SHA-256: 04999b73fe141b9ede3f0e5772f73c4d1dec68efb6dc6ba1c6236ff51d2750b4
font_01_sfnt_off00010fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBF 11092 bytes
SHA-256: c51dc778a3198f450a50b00373fd21e6de7df96e59f99ca3d72f6da92f0e1cd3
font_02_sfnt_off000135bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c