Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bf5b3d420b760c…

MALICIOUS

PDF

81.0 KB Created: 2021-02-20 13:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 32d739389a092d07ed8f3bb42f17d9e0 SHA-1: 24595984b8d9c86ac3e0a42519b1556d60a49755 SHA-256: f5bf5b3d420b760c7e64d1ca41312de9295a3bb4716100e4bdfdcd265d17f44c
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded URLs suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://baarspo.ru/wix?keyword=ff14+culinarian+gear PDF link annotation
    • http://yognat.space/10949775781lm1o0.pdfIn PDF document text
    • http://samo-katim.ru/fundamentals_of_algebra_practice_book_grade_7vvwyo.pdfIn PDF document text
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/rivelidivi.pdfIn PDF document text
    • http://kungfumalibu.com/compulsory_voting_mini-_q_answer_key2nfsb.pdfIn PDF document text
    • http://wssummer.space/como_rechazar_una_oferta_de_trabajo_del_inem7y1j5.pdfIn PDF document text
    • http://qlemelest.online/kindle_4_reset_button_location0emvi.pdfIn PDF document text
    • http://idealslimitaly.site/62028949476p7nh0.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/29fc831e1.pdfIn PDF document text
    • http://nature-ital.space/perimeter_of_square_worksheet_grade_4x1wkv.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/tikefitifitinafj1t8m.pdfIn PDF document text
    • http://educationonline.website/zixirozixomusabuarewb.pdfIn PDF document text
    • http://digitaloffice24.ru/what_is_the_difference_between_the_sonicare_5100_and_6100upcbg.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://s3.amazonaws.com/nawuvud/13395157136.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/apache_hadoop_yarn_moving_beyond_mapreduce.pdfIn PDF document text
    • http://livukizaxavubip.rf.gd/wireless_capsule_endoscopy_seminar_report.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 4656 bytes
SHA-256: c76ab544a21da0c36d195535662cac4526d24a809a1d372b7cc333f479dca72c
font_01_sfnt_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 14080 bytes
SHA-256: e236e7b516b2c06dfffc024b32470fa517fbe71d2fe79fbd601dd8ba3e6d2fc4
font_02_sfnt_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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