Malicious PDF — malware analysis report

Static analysis result for SHA-256 8353a47ebaacc654…

MALICIOUS

PDF

75.4 KB Created: 2021-04-01 10:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1aed231d6a33d796f59984b7eeda3d55 SHA-1: 5187e84c6083250e9e7d7cef85febfae859b075a SHA-256: 8353a47ebaacc654db2bced9c2199ad0f6a17d744381be9e64d39d886e553520
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+to+check+diode+using+analog+multimeter PDF link annotation
    • http://prizyivnik.ru/phonak_brio_4_b-13ez5te.pdfIn PDF document text
    • http://tvoyoproc.fun/nalelovegutn0ftu.pdfIn PDF document text
    • http://homebig.space/where_to_donate_used_furniture_in_njzi4hi.pdfIn PDF document text
    • https://jefilixepiras.weebly.com/uploads/1/3/2/6/132681342/mulizaxanepolof.pdfIn PDF document text
    • http://kapusta.pro/tetemibarupozovexevokelepiejr0.pdfIn PDF document text
    • http://muriwilosakud.iblogger.org/ielts_academic_writing_task_2_tips.pdfIn PDF document text
    • https://gogijufiwadika.weebly.com/uploads/1/3/4/5/134581681/mujebub.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/1e4f4e9b-b0de-4305-8e82-c6e63a49c815/franz_kafka_the_metamorphosis_and_other_stories.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_8ce3803e38214e008704625648811cd6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5862733-ff89-4ab3-9294-7406a2e2fc8c/pioneer_vsx_1022_remote.pdfIn PDF document text
    • http://xuwizigev.rf.gd/petsafe_drinkwell_platinum_pet_fountain_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19cce0c8-9b0b-486d-bdf6-56b9728e277d/vaposijatuweruma.pdfIn PDF document text
    • http://tefotesibeto.epizy.com/monkey_madness_2_quick_guide_osrs.pdfIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_0e9280b62ac143879470281095408bb2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/629cf835-6214-4ab9-bf63-6cbed2aa613e/what_does_the_forgotten_grimoire_do_in_ff12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a34277-4d7e-4c2e-8b48-f2383dae97d5/dieta_de_7_das_para_bajar_la_panza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cba8516-0973-4e92-8134-dcdc6e942af0/speed_queen_commercial_washing_machine_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5214d163-37f1-48aa-81fb-6bf9d9f7560d/female_warrior_tattoo_small.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd86c74-f686-476f-8f61-d08a9fae30b3/vowuzepomase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/294f0862-cf4f-413a-b99e-3a72f0b7c1f5/11601787408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92476a69-bd38-421b-b8cd-42a444f220e1/92365938367.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_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 5468 bytes
SHA-256: b195d160dd6f6a4c0b232902074e157180b4c1526dcdd416544fe2194eb99ea0
font_01_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 10412 bytes
SHA-256: d30aa6a8c5df660862da283627616adda9bbc09719da7bf657ef0fdab076e278