Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c09e2c9761e4e0…

MALICIOUS

PDF

89.9 KB Created: 2021-04-25 03:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e567406a664eb3d3d9b753abca820814 SHA-1: 536503149044171ef278e5fb1bd6995e00ac1031 SHA-256: c4c09e2c9761e4e0794302056e1859a75792e44bb65d494a3b1e267957c1364d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9983

Heuristics 5

  • 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://gimoguvi.ru/strik?utm_term=pentax+k+70+price+in+india PDF link annotation
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/nejakarejikifales.pdfIn PDF document text
    • http://siondez.ru/best_currency_pairs_to_trade_2020nmgxi.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/kogavetota.pdfIn PDF document text
    • http://kapusta.pro/traxxas_summit_1_10_manualal885.pdfIn PDF document text
    • https://tolajugim.weebly.com/uploads/1/3/4/6/134647220/4c6f22c063eb.pdfIn PDF document text
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/kuluwezus-joketinubivodo-josajeriwiduza.pdfIn PDF document text
    • http://copyright-securityx.com/belejeikjvv.pdfIn PDF document text
    • https://filikegepux.weebly.com/uploads/1/3/5/3/135346592/f6feb26.pdfIn PDF document text
    • http://mufajaku.medianewsonline.com/71756318490.pdfIn PDF document text
    • http://okclub.org/dieta_pobre_em_purinas_.pdfs24zx.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/darolilazavorajezipitojeb.pdfIn PDF document text
    • http://copyrightproblem.com/r_bookdown_bibliographyaprhg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/mukutud/98610845275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed2c50d0-aa85-498f-b806-de1dee2e7e59/limapid.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_a19d7b56668b443ebe9f016b12c4c830.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b359353e-2299-4241-86b4-8db5f25b5163/dermatologist_cortisone_shot_near_me.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_ad20c1738f9e40b78fd82092a77322ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/35970336445.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/zawozitugirabakojima.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_26d97333b5c44b24887ac7e321cc08d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/45083435573.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/management_report_sample_doc.pdfIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_5dfd5d2bbc0d419bb5b2f727835c34be.pdf?index=trueIn PDF document text
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_484f6a6d5d434171b1d76b5661695aba.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 5212 bytes
SHA-256: cb2ebee6b243dfa85722306d0d3d2eb957c02b7d2d5c2eada3c3200cb726bec3
font_01_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off0001152d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152D 10540 bytes
SHA-256: ac0522c53616c3909bca4d8c88651ccc82f06881fae3e444f8bf2eae4a734727
font_03_sfnt_off000139bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BF 10384 bytes
SHA-256: e7e095198fc63860408eabc2c742ea51a2518fe86afc4a11b3cf615bfa5757cd

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