Malicious PDF — malware analysis report

Static analysis result for SHA-256 9480a58571923702…

MALICIOUS

PDF

92.0 KB Created: 2021-02-23 02:17:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e1ae30bb7d9c3dfc422490697ec7f323 SHA-1: 3c3f7001f0965c1d84e4c850207e5d935cb4e23e SHA-256: 9480a585719237021335c92e41e4ddaac250192d0994523b865babab75cddeac
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous links to disposable hosting and the overall structure suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=kitchenaid+classic+series+4.5+quart+tilt-head+stand+mixer+reviews In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_600ce1f24e1ad.pdfIn PDF document text
    • http://quickpapp.online/879564826492872g.pdfIn PDF document text
    • http://alcexpress3.xyz/ontario_apartment_rental_agreement_formhygku.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/vubarixuwibipigrsxg.pdfIn PDF document text
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/bowaximimos.pdfIn PDF document text
    • https://povilaromegew.weebly.com/uploads/1/3/4/4/134486615/kapopoteb.pdfIn PDF document text
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/zawikofaxo-kugamusofewoti-vevulifidelixut.pdfIn PDF document text
    • http://bezprovodov.guru/emulator_nds_versi_lama625vq.pdfIn PDF document text
    • http://srakan.space/zibitevir62a2m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455658/normal_600392009a410.pdfIn PDF document text
    • http://naturagrush.space/animated_stickers_for_whats_wall_artj7ibs.pdfIn PDF document text
    • https://xinofebew.weebly.com/uploads/1/3/5/3/135305957/6dda598.pdfIn PDF document text
    • http://mists.space/android_screenshot_settingsxw9ky.pdfIn PDF document text
    • http://myluckywin.site/topuburomuzutujebadip4b2xl.pdfIn PDF document text
    • http://vvinorama.fun/85680011602fa1qh.pdfIn PDF document text
    • https://pofekabebo.weebly.com/uploads/1/3/0/7/130739116/01c47654956ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_5fe693b727895.pdfIn PDF document text
    • http://my-favshopc.online/bexapuronepatibejezujomponn6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00012833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12833 5772 bytes
SHA-256: f3f5a412bfc2233e9f90b17b432c2a10039720d892bccf5d21ebca20bf15ea98
font_01_sfnt_off00013be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE0 11392 bytes
SHA-256: cf3a19a6e3db3fa039d6a72281e728bbb0d6e7c22a5c696eb97f944508e57d30

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