Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6d20611d8fa85f…

MALICIOUS

PDF

70.6 KB Created: 2021-06-04 09:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: be567c1a93e92a127073553535ee714f SHA-1: 557aceaca37923ea86179c36637441294b4d13e4 SHA-256: de6d20611d8fa85f25df635c5a23b9f88285823c980901b0d8bd7652922b831e
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 0.9997

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 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://wastran.ru/pbw?utm_term=mansion+maps+for+minecraft+pe+apk+free+download PDF link annotation
    • https://detazemunowovi.weebly.com/uploads/1/3/4/7/134704720/puxepobifexevob.pdfIn PDF document text
    • https://nakusiwikabudu.weebly.com/uploads/1/3/4/9/134904560/41eba53305ec46c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kafunujazuwo.pbworks.com/w/file/fetch/144578142/how_to_operate_amazon_fire_stick_with_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb3edce-2da8-40b9-9793-c10c4eca088e/woxadabufiwedemijifepuni.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/f/65403785452.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144584106/how_to_use_a_blanket_ladder.pdfIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144449493/78950570582.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/w/file/fetch/144565809/electron_configuration_worksheet_1_answer_key.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/nils_frahm_sheet_music.pdfIn PDF document text
    • http://xorunezagu.pbworks.com/w/file/fetch/144439107/queen_primer_english_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3531eafd-f58e-4e68-abf1-539fb405e39d/sabisekibid.pdfIn PDF document text
    • http://gepefupugalu.pbworks.com/w/file/fetch/144487974/kotagemepojerir.pdfIn PDF document text
    • http://ridelox.pbworks.com/f/jemabalos.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/f/xatoxinesib.pdfIn PDF document text
    • http://wiwudoje.pbworks.com/w/file/fetch/144598158/how_to_download_pokemon_sword_and_shield_on_pc_citra.pdfIn PDF document text
    • http://mupalunava.pbworks.com/w/file/fetch/144579492/bandura_a._1971._social_learning_theory._morristown.pdfIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144484026/putikevusozimutaravej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51afaa8b-6104-4aa1-945b-afa47329cb69/calculate_the_force_of_earths_gravity_on_a_spacecraft_2_earth_radii.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_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 5460 bytes
SHA-256: 35e1135085f3dce48f59f5915bbb1bd14c6546bfa2249754d9bd82d34d0fb45c
font_01_sfnt_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 10340 bytes
SHA-256: adfca91691512e655cac37d0bfcd83ceef6fa759ac8b686a0a44af3444bf619c