Malicious PDF — malware analysis report

Static analysis result for SHA-256 4784ff159f5e4634…

MALICIOUS

PDF

75.2 KB Created: 2021-03-18 11:44:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: a51fe4cecc27a225b6e15d0676cc4e92 SHA-1: 45ac4addb57c31cae928d043332ccb19fb12f392 SHA-256: 4784ff159f5e46346059d4d901e2c56be21c169e0d51574004c9d113f20f9689
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV both flagged this as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs and the overall structure indicate an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://druttle.ru/aws?utm_term=dr+zhivago+2002+watch+online+free PDF link annotation
    • https://posofipijetudu.weebly.com/uploads/1/3/1/3/131380531/modijibilab_wulajogoz_vubepubo.pdfIn PDF document text
    • https://gurewuba.weebly.com/uploads/1/3/4/8/134892349/bubupaxulezogezi.pdfIn PDF document text
    • https://fupemotajupatis.weebly.com/uploads/1/3/4/7/134718556/60ec5d.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/lixepuw_pixuxup.pdfIn PDF document text
    • https://neriborotarisim.weebly.com/uploads/1/3/4/3/134345051/2c3313f031274.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/19961339390.pdfIn PDF document text
    • https://vamububok.weebly.com/uploads/1/3/5/3/135317225/museboto.pdfIn PDF document text
    • https://jedagafigi.weebly.com/uploads/1/3/1/4/131438055/kerubo.pdfIn PDF document text
    • https://rejurikin.weebly.com/uploads/1/3/1/0/131070637/wuzulafusapewelino.pdfIn PDF document text
    • http://dufifudusimube.mygamesonline.org/learn_korean_book.pdfIn PDF document text
    • https://mokufanogokotim.weebly.com/uploads/1/3/1/4/131406807/95013004aa359d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/samsung_m2070_toner_not_compatible.pdfIn PDF document text
    • http://fataragoreb.myartsonline.com/42151436593.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_7ac38f1623e346c8924218fc28e14cf6.pdf?index=trueIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_c16feb56ff5b46728100fd0c97cb76d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d3bf63-e41b-462c-bc94-7523d9e4ef8e/6920346278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd2ae56-3c68-4b51-bdee-bba9aea8130b/62393233711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ffee6a5-f18b-4ede-802e-d916dbdf8fe9/82014338882.pdfIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/sapoladapogozupi.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/highwaymen_2004_parents_guide.pdfIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_67755d2da9134e98af2d9f2aeaf288b2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/27163571269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/607cd75f-6671-475e-b365-d350263ef29c/how_to_program_a_xfinity_remote_to_a_magnavox_tv.pdfIn PDF document text
    • https://115777a2-cc0e-4789-9e99-30cf4bdfca1a.filesusr.com/ugd/2b3546_05ac1a26d0e44051891bdbc9ae117fc0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/how_did_the_alliances_contribute_to_the_start_of_ww1.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_4177a9c114cc4794830c64d9c1e4ca58.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 5440 bytes
SHA-256: b1241323de26ebdaca353f80ecbdbfbd9124422f94278dc3b37284e516455b1a
font_01_sfnt_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 10704 bytes
SHA-256: 6e5a7d5933401a1e9d8b926458e20802359edc7456a1835597c0b73b1e3c7c3e

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