Malicious PDF — malware analysis report

Static analysis result for SHA-256 52028a1e08a72aae…

MALICIOUS

PDF

76.8 KB Created: 2021-04-17 00:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b25b21b4857249f4e5f31f9a1a822495 SHA-1: 997393e896d3cfe973be1525e93cf313b6657b67 SHA-256: 52028a1e08a72aaef6892e108aec9e157e90839b54f9734cc21e3b1d99d2b723
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/strik?utm_term=what+is+molecular+weight+definition PDF link annotation
    • http://websporizle4.com/csf_flow_study_mri_protocol_gem99tp.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/47931927367a1da0.pdfIn PDF document text
    • https://tiporedoxuva.weebly.com/uploads/1/3/0/7/130740235/pisuzekoruriner-wevulupa-gevugimo-vurufefudizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505159/normal_6012c112177c7.pdfIn PDF document text
    • https://fibukumaguwin.weebly.com/uploads/1/3/4/7/134770434/3121034.pdfIn PDF document text
    • https://xijapesulole.weebly.com/uploads/1/3/4/5/134588017/6072158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459777/normal_605c0ff7b5454.pdfIn PDF document text
    • http://9gusevshop.website/unwind_reading_guide_answers43vy8.pdfIn PDF document text
    • https://bakabita.weebly.com/uploads/1/3/5/3/135309819/4452828.pdfIn PDF document text
    • http://cancandance.org/manor_cafe_mod_apk_revdl4i3tk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382638/normal_60014be3211d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420476/normal_605303a59cd8d.pdfIn PDF document text
    • https://lirodenagegoket.weebly.com/uploads/1/3/1/4/131437677/9608548.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/0f3d4f25-b449-484f-8b08-3685fb2ace93/can_more_than_one_user_use_rosetta_stone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/434440cb-fbd5-4d45-9caf-f263b57a269c/rujawepogama.pdfIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_f8d11d3b707f4e3baa32b77734f17295.pdf?index=trueIn PDF document text
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_5dd5d67a935e4fe9b8f18c108e624d68.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e33829b9-abe6-4fad-97be-910a0c7d8c07/replacement_parts_for_sharp_carousel_microwave.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/lagu_berita_kepada_kawan_cover_judika.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/pigenepetinur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd972338-79db-4bda-8d48-33e0002d9a44/american_gods_book_series_differences.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_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 5540 bytes
SHA-256: 5f22f6ba74f9d899ceed916c8df770400f6c30741dfef6cf765269f3320bfb62
font_01_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 11176 bytes
SHA-256: e660c9a63e111e557b876bd4fa74fbfd2f8c4cbfae18dcd854a75eca5450b009