Malicious PDF — malware analysis report

Static analysis result for SHA-256 48711b47752a9be9…

MALICIOUS

PDF

71.9 KB Created: 2021-06-09 11:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2b66dfefcc04780806280e6f68423a82 SHA-1: 3347025ee910bfe55a33b29658cc1589134bb8e1 SHA-256: 48711b47752a9be90fcf8f9efc49d34b0bb81dc45ec29c3d348e0914b9eb7f94
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. One prominent URL, 'https://pixomot.ru/pbw?utm_term=kingroot+direct+download', suggests a lure for downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pixomot.ru/pbw?utm_term=kingroot+direct+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365570/normal_603b89a9b34e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460465/normal_5ff29f6d14da1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_60164b7297b78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_602621fcc0fa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_60464eb269866.pdfIn PDF document text
    • https://lepomanorep.weebly.com/uploads/1/3/4/8/134856804/kapixifixavaku.pdfIn PDF document text
    • https://larigagip.weebly.com/uploads/1/3/4/8/134887586/vebomakidu.pdfIn PDF document text
    • https://pazonijozofax.weebly.com/uploads/1/3/1/6/131606668/3739406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_605f85eb4743a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446925/normal_602527c5d13c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_6011d68399f8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493916/normal_605a9e53134d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144782982/employment_visa_cancellation_letter_format_uae.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3129281f-1202-4ca7-afbe-1d8f90991ec8/how_to_clean_kenmore_elite_gas_stove_top.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e75936cb-c242-4c91-9148-beece4b8cd6d/40716598133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c787947-2cd5-4883-841a-f6350463f1c7/jasamazanekodenanusawato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89610103-e202-48f0-83d3-b2732b75b198/11805901991.pdfIn PDF document text
    • http://kalozewura.pbworks.com/w/file/fetch/144866895/91037224182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf6c9337-3478-4e41-9925-431ae265f35e/huck_finn_quote_about_jim_and_his_family.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad2cf0de-e7c8-4e08-909c-24b67a922ebd/fejazuwade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06862c27-fc81-4963-8368-261ee3faa0d5/72447458103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fa84f09-2a92-4f48-b34a-bb5eb40bfb70/53420729686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2043860-7869-41cf-90b4-f513e4809bf4/dhoom_2_tamil_movie_download_tamilrockers.gr.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_off0000dc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC15 4988 bytes
SHA-256: fc5fd7ec64711b1595b3b7549cd66f6122dd18e2c12c0f409220f5283c26a61e
font_01_sfnt_off0000ed37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED37 10948 bytes
SHA-256: 9c5179cdead39122ca00cbe8bce4b652d39d976970ca80be7159e23480700815