Malicious PDF — malware analysis report

Static analysis result for SHA-256 96aeb1acce5574a6…

MALICIOUS

PDF

75.7 KB Created: 2021-02-19 23:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 62dfbb4a258b7a85c7d249e6bf8947ed SHA-1: 7af362f35d332e8f5a158f276bfe5b9fa0b5c834 SHA-256: 96aeb1acce5574a6264cc2d7e7abb729aa7cf996dab9253b57ffb07cc1de71e6
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and disposable hosting. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed as a link farm. No scripts were extracted, but the overall pattern is consistent with SEO poisoning or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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/wix?keyword=finnish+after+dark+pdf In PDF document text
    • http://busurman.space/dog_licks_screen_video_lwpl7cfmj.pdfIn PDF document text
    • http://my-favshoph.online/61700715117es1b.pdfIn PDF document text
    • http://habercigo.com/autocad_civil_3d_tutorial9jzul.pdfIn PDF document text
    • http://cz-nitrof.website/jurejosiwpswu2.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/hfWjahs/sword_of_chaos_furia_fatal_mod_apk.pdfIn PDF document text
    • http://nesobaka9.xyz/chapter_18_acquiring_new_lands_answers9c6yn.pdfIn PDF document text
    • http://hdvideo.design/sing_karaoke_app_for_pc_downloadws7fw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_600f3de581375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5fd63bd2c0f00.pdfIn PDF document text
    • https://vixixufabajuwe.weebly.com/uploads/1/3/1/1/131163632/majupazebizo_pekivuxijebonum_tigav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_5fd1a1bbae75c.pdfIn PDF document text
    • http://cardioactiveuficiale.site/41503486903twcwj.pdfIn PDF document text
    • http://com-copyrighit.com/konica_minolta_bizhub_c227gm55d.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/iTOAtJT/redskins_qb_broken_leg.pdfIn PDF document text
    • https://pafililesenuxag.weebly.com/uploads/1/3/5/9/135964876/guwazozutox-damirelixo-mokarajilukunun.pdfIn PDF document text
    • http://hardcreditcheck.info/7077919675295qqs.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
    • https://s3.amazonaws.com/tokit/rulafebekigunaputovod.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/negoxevo.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/medical_terminology_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/55523161730.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_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 4792 bytes
SHA-256: f9e2a50f8b9d957661092ce9f5a2addba457c72e20286637c0c4ed8f142de909
font_01_sfnt_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 10276 bytes
SHA-256: 132eb26570d5e6b4c89d9c633d618e680f499cefb8c656719214381c505098a5
font_02_sfnt_off00011395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11395 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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