Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe85bb62438dbd1…

MALICIOUS

PDF

76.0 KB Created: 2021-02-26 06:21:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: cfdba4024a6836466cabfb590d86b061 SHA-1: be5ee8a8749e8e1cbab88e52ee5224c70f9a7f7e SHA-256: 6fe85bb62438dbd12cb863ca02c755e4b8b93e877e04a4d6d22cd977aa810230
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/award?keyword=dungeons+and+dragons+books+barnes+and+noble PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461761/normal_6028f3cc36633.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/iczyxDA/zofabenabotifi.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/7905703.pdfIn PDF document text
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/vivagozesit-bidajisezom-penowuxorol-revofudopop.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/vhaL6GP/8251024630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461234/normal_6015dc1bc906d.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/hehhibT/emoji_craft_mod_apk.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/how_to_calculate_inflation_adjusted_return_in_excel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446165/normal_6038304cd4317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5fd98798ecb30.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/iiPhgid/85412475723.pdfIn PDF document text
    • https://garujidizog.weebly.com/uploads/1/3/1/3/131398488/pibabune.pdfIn PDF document text
    • https://xivimuwujaka.weebly.com/uploads/1/3/4/4/134440816/xexorel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411483/normal_5fd092b071ce7.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/xA36iag/8634342852.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/ddPjdja/nasibitofirom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_6009f83cd1316.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tivakifuzir.atwebpages.com/ronibere.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/tusazapipeluz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 4948 bytes
SHA-256: 792e19c4131a644a6b60bc81b48a68f8a7fdb64b45229ac1ec2dd328429f6e12
font_01_sfnt_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 12144 bytes
SHA-256: 09a82c9f8a6c246f2bf2861d881258dde48c14114153511f3fba27060b95999a
font_02_sfnt_off000114a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A2 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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