Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb284778a0d047c…

MALICIOUS

PDF

89.0 KB Created: 2021-05-30 06:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8e1fce6924b16c8dca3526dd8fc02c66 SHA-1: cfb6fa4724b35fa92c4efc70ffb65d6f006b1651 SHA-256: 4cb284778a0d047cd2ee97c04b71b2657ab56756cb403118d233c133a064eeb9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mezovuduw.ru/123?utm_term=code+of+conduct+template+word+uk PDF link annotation
    • https://ripodomix.weebly.com/uploads/1/3/0/7/130775876/sajagulodidufilekek.pdfIn PDF document text
    • https://gajodugibo.weebly.com/uploads/1/3/4/6/134635488/d21bbce84e817.pdfIn PDF document text
    • https://kiburosipaso.weebly.com/uploads/1/3/4/6/134601321/bf30e.pdfIn PDF document text
    • https://nizuwutino.weebly.com/uploads/1/3/1/4/131482859/7012599.pdfIn PDF document text
    • https://kuzeposevitisol.weebly.com/uploads/1/3/4/8/134881899/mebew-zasifiposodos-livijeliven.pdfIn PDF document text
    • https://jigurojo.weebly.com/uploads/1/3/5/3/135321607/1767865.pdfIn PDF document text
    • https://pepotojil.weebly.com/uploads/1/3/4/9/134900045/7975851.pdfIn PDF document text
    • https://fomimelagesuto.weebly.com/uploads/1/3/1/4/131406840/8036452.pdfIn PDF document text
    • https://zafivagofe.weebly.com/uploads/1/3/6/0/136011523/ralixesobum.pdfIn PDF document text
    • https://nopufara.weebly.com/uploads/1/3/3/9/133999240/4e4786a40da.pdfIn PDF document text
    • https://vuwurata.weebly.com/uploads/1/3/4/4/134481670/sotezezipe.pdfIn PDF document text
    • https://tebokatesax.weebly.com/uploads/1/3/3/9/133999418/metefotodadefogukuvo.pdfIn PDF document text
    • https://fogevama.weebly.com/uploads/1/3/1/1/131164507/tivivodevanebov.pdfIn PDF document text
    • https://kemoborinavimes.weebly.com/uploads/1/3/4/8/134874231/moduxowajanod_wonifidarobotim_fekivozebejete.pdfIn PDF document text
    • https://gitapobukelagij.weebly.com/uploads/1/3/4/2/134266265/1013822.pdfIn PDF document text
    • https://bisomimimuj.weebly.com/uploads/1/3/4/5/134526732/lixabonivuta.pdfIn PDF document text
    • https://warajepujevofi.weebly.com/uploads/1/3/1/8/131857140/5c9d5b3532a7f07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/987e8108-f5cc-4809-8702-5e684ce60c3a/what_skills_are_needed_for_data_analytics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eabbbfac-6897-4a38-a7de-793bf30900c7/gevazafumemudiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/432654cc-ef14-4dc3-a28f-3b7c6ed71f12/pros_and_cons_of_transformational_leadership_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5079176a-84b7-4f9d-81f6-3aed9806246a/list_of_terry_goodkind_sword_of_truth_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c3b5e9-690c-4344-9087-b08d91bba5ab/new_look_white_denim_skirt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55692290-231a-4e1e-817b-4133404c325d/raising_a_modern_day_knight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/393aa125-9fc2-4ae6-8149-3a2c5785fa6c/are_all_kitchenaid_attachments_interchangeable.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 5184 bytes
SHA-256: cc9c89ac614ba3001c8c96e0f0911c40a26f108b74b786b7ab1519414dc0da4f
font_01_sfnt_off00011836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 11956 bytes
SHA-256: 73f0bf89648454fad8278b92c152f6d39d4dd96ece3a9deeb7a18ea1c6de24de
font_02_sfnt_off000140d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D9 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf

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