Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32c951d78b0cd11…

MALICIOUS

PDF

121.5 KB Created: 2021-03-05 09:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a3d24c141388b8d01886a68a2f3021ca SHA-1: 9423349ebcea5760272de179c5e1466e7b639ea8 SHA-256: c32c951d78b0cd118b3f5560bc22f9e3b84ab3370c0708a1ef5b7ad3a1a8dcce
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/award?keyword=alone+together+sherry+turkle+analysis PDF link annotation
    • http://devicesprotectionforusers.site/kijiji_buy_sell_and_save_on_local_deals4cnrx.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/gJtVdgc/fimezekaboretiduvadafutuf.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/vsiijgp/68333775172.pdfIn PDF document text
    • http://sfhgfje5df.xyz/les_quadrants_abdominaux_et_leurs_contenus4efdi.pdfIn PDF document text
    • https://cdn.sqhk.co/worekoxe/dhcffif/28699869127.pdfIn PDF document text
    • http://widopomulagu.22web.org/36797049096.pdfIn PDF document text
    • http://lnstagramverifycentre.com/how_to_backup_android_to_onedrive91mkz.pdfIn PDF document text
    • https://cdn.sqhk.co/vitozogog/jaihDdU/julofawonusavelonu.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/igcvg4E/syfy_wire_app_not_working.pdfIn PDF document text
    • http://sodaapp.club/design_system_template_xd8cve0.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://uploads.strikinglycdn.com/files/9b1d73ab-b2e4-4455-a9d9-ef807bb3cab2/coordinate_geometry_formula_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc39ce08-f995-4287-8520-4f6e9ea24704/lauren_kate_fallen_series_unforgiven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc61458-7cc9-4aa7-9844-b329f87d7f6d/quantum_field_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81c4263-8916-4420-8886-7b766f15135c/five_nights_at_freddys_game_unblocked_download.pdfIn PDF document text
    • http://bajejefi.epizy.com/derry_nh_police_incident_report.pdfIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_10dc532050cc45b2b0c0d3de80a7625a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c17498c-eccf-4521-9495-6567e623a4c4/widejutafikap.pdfIn PDF document text
    • http://tonixororonimi.rf.gd/telugu_christian_audio_songs_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f1d362f-a4c8-491f-9835-41ba402318fa/are_baby_bouncers_safe_for_newborns_to_sleep_in.pdfIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_0ae7a7b477a74ae2a2dbcb9caeced37d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e633fdf9-b6d0-42f8-aef5-8dfc79ec1f2d/13187631212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7afae621-c0f6-48c5-9842-4b8c771d7778/rikizuboxoxomu.pdfIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_51cf7d13a5214d62af87c56627ca93f2.pdf?index=trueIn 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_off0001959b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1959B 4984 bytes
SHA-256: 18a4919488aafa9394aa63e972e09d782a78f1f8ae81b8b6cc77af72d2a032c6
font_01_sfnt_off0001a68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A68C 10364 bytes
SHA-256: 2b64f9435ab291454edde69735318605e636afe45af776394bf5a53230dafdbe
font_02_sfnt_off0001ca0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA0A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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