Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45b9f9c4b1de389…

MALICIOUS

PDF

74.5 KB Created: 2021-03-03 07:10:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4723f6e92d84a230e2f5bf73d1cb464a SHA-1: 35ab072c5105e881a338c467f447fdcd2a5c2e7a SHA-256: a45b9f9c4b1de3892ff6c14e74682d567b7498a3e81084f5a2af12e513935bb6
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://mezovuduw.ru/strik?utm_term=comcast+latino+package+channel+lineup PDF link annotation
    • http://nakodinita.scienceontheweb.net/3_letter_airport_codes_in_india.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/lapuponogipuf.pdfIn PDF document text
    • https://fixizogi.weebly.com/uploads/1/3/5/9/135959929/bozubepevat.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/35104563258.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/39533d5a159.pdfIn PDF document text
    • http://olivamebel.com/gefirapupuwamuxawefaxefq6vz.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/kejasesikivujetiv.pdfIn PDF document text
    • http://revershjtb.site/biomechanics_of_sport_and_exercise_mcginnisvogak.pdfIn PDF document text
    • http://piredvizhnik.com/juzuwe7gurn.pdfIn PDF document text
    • https://jobeluraxofedir.weebly.com/uploads/1/3/4/3/134317239/b2ada7.pdfIn PDF document text
    • http://santaparker.store/749957893117jj8j.pdfIn PDF document text
    • https://kuwuvolabakeg.weebly.com/uploads/1/3/1/4/131407812/rotedi-dewilagowoximi-tirinokoxor-fosagudunujox.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/cuantos_milimetros_tiene_un_centimetro_cubico.pdfIn PDF document text
    • http://totalcreditcheck.info/opentx_companion_2.0_download5jw10.pdfIn PDF document text
    • http://vuvajujuli.mygamesonline.org/95169264526.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rojanesifilagu.myartsonline.com/zedufozamara.pdfIn PDF document text
    • http://fazaburifug.myartsonline.com/percy_jackson_and_the_lightning_thief_book_chapter_16_summary.pdfIn PDF document text
    • http://gogujigasad.onlinewebshop.net/97308990111.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/sims_3_for_mac_steam.pdfIn PDF document text
    • http://lipesomidu.epizy.com/3ds_emulator_apk_with_bios.pdfIn PDF document text
    • http://mazixafaxuxil.epizy.com/lijofuropivudizuliforol.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_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 5220 bytes
SHA-256: e6f22f3be3c4e5e36cc98bf2e0e7c0c987d05f50aada94e9883a125b2953995f
font_01_sfnt_off0000f651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 11236 bytes
SHA-256: b58ccb85c7a89499ba99e976ffae2c5e42945f43e9c79e169f4fa43a395bd6ee

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