Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fc981755319949…

MALICIOUS

PDF

80.5 KB Created: 2021-03-26 03:19:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5d5c665b49112411f3cc524f36f650a3 SHA-1: d71c857cd5baa49be3a51698c94fd3dad9afe06b SHA-256: 71fc981755319949f67f67bc9b7afab7025b4819e78f1b87533b1ec0d987df08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9990

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://seumenha.ru/123?utm_term=amman+god+remix+video+songs PDF link annotation
    • http://cafe-cok.ru/alvitec_informatica_so_carlos_spko5ui.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/the_conference_of_the_birds_ransom_riggs_wiki.pdfIn PDF document text
    • http://pornbustyvids.com/88934986177q00l8.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/sDeijpG/pocket_door_frame_sizes.pdfIn PDF document text
    • http://alkostore.xyz/best_home_espresso_machine_2020_canadaul0pf.pdfIn PDF document text
    • http://medemukiduba.sportsontheweb.net/lubudelukififiginenamonad.pdfIn PDF document text
    • http://dixefez.iblogger.org/what_do_you_eat_on_bright_line_diet.pdfIn PDF document text
    • http://zinefikitozozeg.sportsontheweb.net/61482733605.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/ijcWpjd/lab_equipment_unscramble_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/gphbpij/playrix_gardenscapes_support.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/hgfc4jf/lenofuwemowidinu.pdfIn PDF document text
    • https://cdn.sqhk.co/falunibesedo/ihhftuZ/japanese_alphabet_symbols_with_english_translation.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://uploads.strikinglycdn.com/files/b4679aa6-58e4-411b-b1f8-785b76a32cba/zepupadutewutedob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4ba80d-09ae-4008-8e0a-090acd738392/89070202231.pdfIn PDF document text
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_caa8327581b449b0bd216ab43b5494b6.pdf?index=trueIn PDF document text
    • http://nodedewagi.epizy.com/xujeturulufaxutesokove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e5c8521-5583-4bbf-ace1-83061efe25cb/what_are_the_3_things_the_declaration_of_independence_does.pdfIn PDF document text
    • http://pilulozames.epizy.com/baby_names_book_online_free.pdfIn PDF document text
    • http://jokiperone.epizy.com/mobogenie_old_version_apk.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_ff3cfe798fdb46549005a1a63df10eac.pdf?index=trueIn PDF document text
    • https://893c8be9-d140-4a04-8a3e-66bd54b472cd.filesusr.com/ugd/efd7ea_aad7c0a9a97b49e3b33dd42dbff1eeab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d8a875b-5f03-4ac7-bbaf-ae2e07766be4/jay_z_444_the_story_of_oj_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/544df35c-b3f8-47e2-9aeb-770628fa2dfa/86955866290.pdfIn PDF document text
    • http://lekekavom.epizy.com/kikigo.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_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 4936 bytes
SHA-256: 45e8d8f51206d76e9c9ba1a25602a8fb598f8871549d196463ef27e742d86ea0
font_01_sfnt_off0000ff49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 11588 bytes
SHA-256: 14b641432aefd16e757395037552a250412fc0ca899e1f9804db4c3f66436ea7
font_02_sfnt_off00012665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12665 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378