Malicious PDF — malware analysis report

Static analysis result for SHA-256 4edfd94a0202adea…

MALICIOUS

PDF

80.4 KB Created: 2021-03-25 16:30:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b5ab20d8d7dcad2d9e6f390a3a483cb7 SHA-1: 121c36cbf117b4f16e25ea0fa7090b8f9f12392f SHA-256: 4edfd94a0202adeaee28e9559238de3c4e6c1a2a2c457a84b7d0981cf7b85b64
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 0.9990

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://maypoin.ru/award?keyword=telugu+academy+anthropology+books+pdf+download PDF link annotation
    • https://megeludok.weebly.com/uploads/1/3/4/5/134595993/bbaf442633.pdfIn PDF document text
    • http://zipimenegan.iblogger.org/59227987059.pdfIn PDF document text
    • https://vejejalerejoji.weebly.com/uploads/1/3/4/6/134600164/3fa42.pdfIn PDF document text
    • https://xotukejurivaj.weebly.com/uploads/1/3/4/0/134016857/620d744a21a1fb.pdfIn PDF document text
    • https://teriwogawuf.weebly.com/uploads/1/3/2/8/132815342/3457082.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/aad959a2-6068-43bd-8bc0-1c10d79d2a64/hardest_christmas_word_search.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f096ba9-53f5-4f5e-a511-b26fc58aae75/p28_ecu_wiring_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/65140522129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f90970a3-6b85-4b17-8c57-d61b0161491b/kobonubezezaguzidutiraj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd318cad-fc30-4b8d-b16f-e8103745761d/how_much_does_it_cost_to_do_a_forklift_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/885d6d83-9f20-40f7-95d5-34d8d5ce316d/wall_street_journal_index_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f38b60e-930b-4093-bd8d-2d687c694e5c/how_to_use_kindle_touch_instructions.pdfIn PDF document text
    • http://waboxizolomove.rf.gd/punjabi_hd_movie_site_name.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/gaggia_classic_2020_review.pdfIn PDF document text
    • http://tulinavosubod.rf.gd/aristoteles_historia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f7a5c5-979f-45a8-a885-bf07c9deb704/pipefitters_union_pay_scale_california.pdfIn PDF document text
    • http://benifolagalat.epizy.com/sketchup_free_web_version.pdfIn PDF document text
    • http://sarirepenibe.epizy.com/small_baby_laughing_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/jedifakej.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/science_fusion_dynamic_earth_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/xemaruwusamofewunejabibow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f65e1d03-9dc2-423f-a51f-8097f47556be/9894456809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d846a39-58fc-40d2-99e4-7ad17718c7f2/kafolavovakakujibemuwopem.pdfIn PDF document text
    • http://kopixagelaje.rf.gd/kagirewubelopibebo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 5916 bytes
SHA-256: 9ce42ad8b2eb9aece029171cbe4bbc4819fa95faf864b4476ff3f5caeb89c9d6
font_01_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 11064 bytes
SHA-256: 8c461201cb6fcafaef98c5beca54221e54c8504e7061b82abaee0208ea2aeac8
font_02_sfnt_off00011c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C18 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6