Malicious PDF — malware analysis report

Static analysis result for SHA-256 9881804c09a45cae…

MALICIOUS

PDF

82.6 KB Created: 2021-03-09 03:28:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9d6b14c105e438cbcc51a0aa96150a4d SHA-1: 2398f37b8c0a488f4f1330e34934ec46fbad62c6 SHA-256: 9881804c09a45cae6ef839fcdf733afe1e4e7d259f808e252ddc103e70395502
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external links to other PDF files hosted on various domains, some of which are disposable. This technique is often used for SEO manipulation or to distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=altered+carbon+season+2+review+guardian PDF link annotation
    • https://fapezadedafax.weebly.com/uploads/1/3/4/6/134609176/cd3a0e91.pdfIn PDF document text
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/231dca98a097a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469386/normal_5fdabf3a3e10d.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/6efd5ddaf005a0d.pdfIn PDF document text
    • https://sezavifibeka.weebly.com/uploads/1/3/4/4/134463458/6d61570a12aea6.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/IjflWih/wurususovepiso.pdfIn PDF document text
    • https://cdn.sqhk.co/garisuvonuk/i4gdhjO/roman_numerals_1-_20_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466379/normal_5fe2897850f18.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/dziauha/megapolis_city_building_simulator._urban_strategy_apk.pdfIn PDF document text
    • http://duwelizub.mywebcommunity.org/nulafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_603422a93c02e.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/ae53b6519.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/aPhbggG/agricola_score_sheet_printable.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tobidogajetu.onlinewebshop.net/tolusitofoleli.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_a6525833d804458c9eb0862c49d0505a.pdf?index=trueIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_96c6b73eb5594c928a1aa13291d40e8d.pdf?index=trueIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_60dff850e4234a4db58f2637c35af287.pdf?index=trueIn PDF document text
    • http://rinimodosejowuf.myartsonline.com/how_much_does_it_cost_to_buy_adobe_illustrator.pdfIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_e643dcd910964c67b1ac678bc056acbd.pdf?index=trueIn PDF document text
    • http://gitojaxekeveki.onlinewebshop.net/kotal.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_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 5520 bytes
SHA-256: dc132238d127a3dd9d25f7e1010ceebb5122ab13e9d99c8c405ea6bbabd02109
font_01_sfnt_off0001188b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188B 10812 bytes
SHA-256: 204eb9a6d655e9db3e99a41495f5210935ae7693388ab6896e02ef60efc916c1

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