Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd32765984c0f028…

MALICIOUS

PDF

75.8 KB Created: 2021-04-19 11:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5405a7d38fb24d318da9fbd883b9a4d1 SHA-1: 404ff2a0edb03db96928833feb04d1cf7c61c443 SHA-256: fd32765984c0f028be7c62867e212c77ab6fbf4883dbb57851cbb83fd33b2704
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to typography. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://leonvi.ru/strik?utm_term=what+is+it+meant+by+the+term+typography PDF link annotation
    • http://bakelenodizaro.iblogger.org/bmw_320i_e90_2008_owners_manual.pdfIn PDF document text
    • http://nufudaluwunuja.22web.org/why_is_my_printer_not_printing_on_the_whole_page.pdfIn PDF document text
    • http://fofikotopavabe.iblogger.org/44662004379.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/7571881.pdfIn PDF document text
    • http://silofabinewu.22web.org/39700162619.pdfIn PDF document text
    • https://revawowi.weebly.com/uploads/1/3/5/3/135317167/womekivelavaj.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/68696553065.pdfIn PDF document text
    • https://bolojowugupi.weebly.com/uploads/1/3/4/8/134886087/1b918.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/popilo/functional_independence_measure_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/fozuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/294331c1-87c5-4c1f-b569-51ccc4f13586/42404252564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5f0f621-4dc2-4cab-b6d9-5e1342fde103/pivopawaz.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/guwesofejidexufuvow.pdfIn PDF document text
    • http://nekelaxowe.atwebpages.com/morphemic_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/61390252615.pdfIn PDF document text
    • http://gibexuge.rf.gd/19863051144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/202dd971-e136-49cb-b59f-eea91f7773f7/how_many_carbs_in_burger_king_double_cheeseburger_without_bun.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/alfresco_community_edition_5._0.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/how_to_disable_apc_ups_alarm.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/supubisawonekotori.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/bositutetilotiw.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E6 5456 bytes
SHA-256: 00ff2968b473d5c0bca90b8c271490b43f7b432e725457d437403927cdcb964d
font_01_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 11096 bytes
SHA-256: 8e86e11a41cdeb7dd450ab1d9951791e634ec4a18a0277fe2f4f9debc17be035

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