Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd435fe1108969f…

MALICIOUS

PDF

74.4 KB Created: 2021-03-17 10:57:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b3f38ed7ad33e02ae94a132e3d199de3 SHA-1: a3f1fd4788ec348d3fe5687e7a70a516a3b1e01b SHA-256: afd435fe1108969fd73ec4ee41f8fe44b2e856264832615106b30b6b5294fca0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://resalured.ru/strik?utm_term=how+to+dry+boletes PDF link annotation
    • http://idealicaitalia-oficial.site/viridian_city_pokemon_revolutionqk5tx.pdfIn PDF document text
    • http://nudistoff.club/biology_sba_lab_report_samplefln1h.pdfIn PDF document text
    • http://wordsidepost.top/how_do_you_get_a_double_dapple_dachshundjnkyj.pdfIn PDF document text
    • https://kafuribawixunav.weebly.com/uploads/1/3/4/8/134897544/kajalerura.pdfIn PDF document text
    • http://liketime.online/variwuf4hbeq.pdfIn PDF document text
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/4215587.pdfIn PDF document text
    • http://ihsteam.ru/ielts_practice_test_2020ixp4r.pdfIn PDF document text
    • https://dibevapanowodi.weebly.com/uploads/1/3/0/7/130776811/lonanixobofobaxif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_5cf1edc2bd064f10938ab245833d729a.pdf?index=trueIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_b02cb30ad42e48e59e16e24d426d5b83.pdf?index=trueIn PDF document text
    • http://dixolasafu.epizy.com/actualizar_navegador_chrome_android.pdfIn PDF document text
    • http://fipinajamidab.epizy.com/8907678714.pdfIn PDF document text
    • http://fozosoripivo.epizy.com/michelin_guide_bangkok_book.pdfIn PDF document text
    • http://magetamuwunaze.rf.gd/ribumevogabevama.pdfIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_885e674c6f4c4e24a4049a8be578e7e6.pdf?index=trueIn PDF document text
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_263bf38ca3ab4355b8bf59378dbf8914.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_50dd88bbced8475cb9a819e1d62b9dbc.pdf?index=trueIn PDF document text
    • http://mapoler.epizy.com/body_systems_diagram_worksheet.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_off0000e6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C9 4904 bytes
SHA-256: 7612bc8ee1e04f890720588ff39d5b2e5dbb3face111b41c190dcc4ef62fd4d7
font_01_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 11092 bytes
SHA-256: ae439eb2420b17b520330cf1d610f31df8274ee1bfcbe44d65336c50c7803994

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