Malicious PDF — malware analysis report

Static analysis result for SHA-256 9681930ee2ab0444…

MALICIOUS

PDF

74.7 KB Created: 2021-03-18 09:07:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1abb4ef6525348fd6dbff2d554cc5ce2 SHA-1: 04e196ea8a39c201bd8883718436b363d9541504 SHA-256: 9681930ee2ab044466b8d020956ae5f4a3fcd65b3084ade6d6bcfa607b896eb5
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://golowaki.ru/wix?keyword=csun+spring+2020+graduation PDF link annotation
    • https://wemizufatevovig.weebly.com/uploads/1/3/4/8/134896488/basuw_patipitidapem.pdfIn PDF document text
    • http://smartcoin.design/equifax_credit_report_address_and_phone_numbervqqo3.pdfIn PDF document text
    • http://fimokeroda.22web.org/45667711247.pdfIn PDF document text
    • http://milano-moda.space/tiny_battle_simulator_indir33imx.pdfIn PDF document text
    • http://kimokabif.medianewsonline.com/how_to_find_the_critical_values_of_z.pdfIn PDF document text
    • http://garobunatuxovi.scienceontheweb.net/76025885020.pdfIn PDF document text
    • http://demuxum.getenjoyment.net/ayatul_kursi_download.pdfIn PDF document text
    • http://physcoo.com/baby_bassinet_sheets_australia1x8vc.pdfIn PDF document text
    • http://mopowataxix.medianewsonline.com/solving_algebraic_inequalities.pdfIn PDF document text
    • https://nipixejewawowe.weebly.com/uploads/1/3/0/8/130874539/moxesare.pdfIn PDF document text
    • http://usacarins.com/85692621840zo32u.pdfIn PDF document text
    • http://ccckkkkk.space/29285776508o8wt9.pdfIn PDF document text
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/towavabo.pdfIn PDF document text
    • http://gakmancreatures.ru/clash_of_clans_magic_iosqzmvd.pdfIn PDF document text
    • http://003-center.ru/how_to_calculate_interest_on_a_line_of_credit_loanmuutw.pdfIn PDF document text
    • http://figejewumoposes.getenjoyment.net/castrol_edge_fst_5w40.pdfIn PDF document text
    • http://cparta.moscow/bigujirolelabowidufudo6msd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jilerixam.epizy.com/nojonaguv.pdfIn PDF document text
    • http://sivokag.epizy.com/xoxujexab.pdfIn PDF document text
    • http://dobigovoba.rf.gd/2009_nissan_sentra_service_manual.pdfIn PDF document text
    • http://zasizekid.rf.gd/scrabble_rules_uk.pdfIn PDF document text
    • http://kimirukuku.epizy.com/44307498400.pdfIn PDF document text
    • http://xabiworaw.epizy.com/breaking_the_rules_book_series.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_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 5272 bytes
SHA-256: a056a2fcc6a34fb7caecb57767ecf9a12dbefc30682d547194340aa3ecb08970
font_01_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 11320 bytes
SHA-256: da6b153e4e61cc60609b187a2c1809c6bf5581a1f775d1aae2b2e77633a338b8

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