Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c35ab85d6754a1…

MALICIOUS

PDF

91.3 KB Created: 2021-04-06 23:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d6af5e762bcc62db435e75d351d79976 SHA-1: 5fab1a69ea3aa6eb94049c57118fbc997b1d43d8 SHA-256: f3c35ab85d6754a191108dad4e1766b4e7a583c84851f8598404bfc27fa20e91
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=skywalker+trampoline+basketball+hoop+canada PDF link annotation
    • http://gnoogle.site/74916671046kg28n.pdfIn PDF document text
    • http://francobusiness.com/zefevezagojagesajufoweeph5o.pdfIn PDF document text
    • http://vengriya.space/vozolaxep2e0r7.pdfIn PDF document text
    • http://dirtygirl.fun/97104744665e0wgg.pdfIn PDF document text
    • http://endi-itali.space/venom_wallpaper_4kdjufj.pdfIn PDF document text
    • http://xipodijajul.sportsontheweb.net/50085837592.pdfIn PDF document text
    • http://lafowesezojo.scienceontheweb.net/squat_challenge_free.pdfIn PDF document text
    • http://1fps.ru/hyundai_i10_manual_repairc3s62.pdfIn PDF document text
    • http://arenaprobet.com/29202224793cbdrf.pdfIn PDF document text
    • http://com-copyrighit.com/halo_free_download_unblockedtjzu2.pdfIn PDF document text
    • http://peluxuba.sportsontheweb.net/zexaguboratilup.pdfIn PDF document text
    • http://on-arenas.com/the_republic_star_warsh1qts.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/xeroxolisisolamokinammo6dt.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/51704893184d776n.pdfIn PDF document text
    • http://paxosij.mygamesonline.org/54876383504.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/52fea5e1-47c8-44bb-a286-6b3e0b2f594a/murobejokogeger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e6398a-9218-4ff0-b713-ff93f7973ea5/learn_english_app_for_adults.pdfIn PDF document text
    • http://dipagepe.atwebpages.com/vokisisaxuko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7a25f76-26fa-4ff5-923e-69ffe8898e10/keeping_the_republic_6th_brief_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb3130e1-e63c-4157-99f4-eb921368bdee/why_is_my_transmission_not_engaging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79026733-364a-48ab-a719-85d0251e7c07/horton_hears_a_who_full_movie_in_hindi_dubbed_watch_online.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 2912 bytes
SHA-256: 1baa3efd180cf5f44d613abe34ea0380c2d25dd221f4ef864ac418d56f73cc35
font_01_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 5812 bytes
SHA-256: 50fc8dffae32b350ce2da36e5e6be78b7f2f4deb648cdbbe12701529778ab7a2
font_02_sfnt_off0001257f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257F 6068 bytes
SHA-256: 58b4873d33ac9fffaf45ed1a2312b8eb5fadf3b067e77f8cfe9e87095f6a7717
font_03_sfnt_off00013530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13530 12412 bytes
SHA-256: dbb6fcd94eefa7a0dd80db3a6fd5daed23c0d0454a0e1f325c1a09d91b8071f1

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