Malicious PDF — malware analysis report

Static analysis result for SHA-256 850038b2488ca34e…

MALICIOUS

PDF

74.2 KB Created: 2021-05-11 07:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a5e4021a20fd2e6165c637d0f4314a00 SHA-1: 704847631547408a87b3bb2c3ed5c3e062e14e23 SHA-256: 850038b2488ca34ec44dab99d5dd8c0782655dea9a9534488c182daf7421cd04
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 0.9998

Heuristics 6

  • 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 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://baarspo.ru/strik?utm_term=why+isn%2527t+my+dishwasher+drying PDF link annotation
    • http://cuzinfo.ru/acoustic_audio_aa5170_review5hlcj.pdfIn PDF document text
    • https://cdn.sqhk.co/sepovili/jcBhbQU/skyrim_dragonlord_armor_mod.pdfIn PDF document text
    • https://dozunetad.weebly.com/uploads/1/3/4/4/134472758/rizan.pdfIn PDF document text
    • http://tovelksa.website/tomo-chan_wa_onna_no_ko3liip.pdfIn PDF document text
    • https://zizonilorixu.weebly.com/uploads/1/3/4/7/134772478/zewiw-varaneba-gejogakililawi-pazuvaf.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/cDgctjd/the_elder_scrolls_blades_mobile_gameplay.pdfIn PDF document text
    • https://wufisosudima.weebly.com/uploads/1/3/0/8/130874090/mifabewa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc7577ea-3f49-4012-8414-f7cd1e37b3f9/how_to_write_performance_review_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22e6e2d5-78f6-4bef-9fd1-f1ff01ce1214/59183503631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ffe9a2-8017-4f39-afb2-a10242dd4dcd/xisoxajuxemezuf.pdfIn PDF document text
    • http://lepevalir.rf.gd/sibibamibudopemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99226a36-d6f0-4594-8bc8-49a03da81c37/sel_351a_ordering_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16e92b4-753c-468f-942b-70f9311ef933/vixopikoxifuduzemufuzuse.pdfIn PDF document text
    • http://memapekoge.epizy.com/ansys_tutorial_download.pdfIn PDF document text
    • http://tijopuzotozume.rf.gd/dofakisajoki.pdfIn PDF document text
    • http://bupixifebinare.epizy.com/avery_dennison_rfid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4a60d8-690a-45a0-b66d-4bffddada026/inferno_dan_brown_movie.pdfIn PDF document text
    • http://pezuxegoweniger.epizy.com/xoxixaxutanuwuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74274c86-dbe5-4797-a50f-9d78f7dee4d4/beachbody_reset_meal_plan.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_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 5448 bytes
SHA-256: 33980fa1bb122c616ae328187844c32ceedea51597cc7da2c10208dbce718343
font_01_sfnt_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 9924 bytes
SHA-256: 6fac6b414072a8b26dde8f2c4ff6d9c388a9aec9107eb122da40b77fa63afae6