Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f8a704aa4ff4a3…

MALICIOUS

PDF

79.5 KB Created: 2021-04-05 15:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 17805b6d4361d43eb7c8de4a184db81c SHA-1: 965a143212e05d5966275dc1a6487d25e9a2a7de SHA-256: 02f8a704aa4ff4a3e84a3e871e10bab29cacd69402f7b7f2e456fcce88bf5cc5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/award?keyword=hernia+umbilical+e+inguinal+pediatria+pdf PDF link annotation
    • https://cdn.sqhk.co/bemememu/ZhbokMh/war_of_the_worlds_full_cast_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/ghhgt32/lidodenelagib.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/aDry34V/pizza_hut_hand_tossed_vs_thin_crust_calories.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/gg7hj7s/slice_of_heaven_pizza_long_beach_island.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/f6iixAw/reversible_reaction_symbol_latex.pdfIn PDF document text
    • https://cdn.sqhk.co/jobezivozuf/DhgqgjA/40106046303.pdfIn PDF document text
    • http://sejusadi.22web.org/gopigubaxedadekebugut.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/aHrihhd/best_live_wallpapers_for_samsung_galaxy_s8_plus.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/RicGggW/bomber_crew_deluxe_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/nozesinipi/BnghZUV/xuniluwuxinotududelobuvij.pdfIn PDF document text
    • https://cdn.sqhk.co/xumobopore/fttMwif/minecraft_classic_servers_2018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_a413933d58784567ad45e7cf1f7f91ee.pdf?index=trueIn PDF document text
    • http://bogadigoxizalux.epizy.com/square_root_of_204_in_radical_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/13901482765.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/code_of_conduct_template_word_uk.pdfIn PDF document text
    • http://vuxupib.epizy.com/how_to_install_webos_on_lg_tv.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_41e22da517d54e57b269fa6dc16bb4f0.pdf?index=trueIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_5a3dc1a4fc324dfe9ea8d54deedb88a6.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_de5cf767ab11490caa929b5f0e36fcf0.pdf?index=trueIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_63e814acc1c046a2b9233ed91d0d6d23.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_d89557c5e38f4d21863943afa3aec70a.pdf?index=trueIn PDF document text
    • http://vasugam.rf.gd/9813138094.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/beatles_free_music_sheet.pdfIn PDF document text
    • http://ladisopezaxak.epizy.com/98273108103.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_5cc3c2f517324982a4849260bf4d55fd.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_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 5400 bytes
SHA-256: c04d2afec37a74e0ba2e37eaee07f28ed1a92ade99e3bb50aec0d2cc8dd9bc6e
font_01_sfnt_off00010d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 10320 bytes
SHA-256: 1ef06b9130ccb059adaca7a059210baaa345e367e814c85cdb89136a1e0033a5