Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49263c8fef68840…

MALICIOUS

PDF

76.0 KB Created: 2021-04-08 02:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f78857f52707720448c1bb7b2163f606 SHA-1: 567382d9b315f53ff73c7226f5740fb3250c7e7e SHA-256: f49263c8fef68840aeb0dc87c66466203673d105487b91582a3ad940cf9f2aca
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 0.9948

Heuristics 5

  • 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 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://golowaki.ru/123?utm_term=example+of+broadcast+receiver+in+android PDF link annotation
    • http://xuxisozolawub.22web.org/lapejasufulaj.pdfIn PDF document text
    • http://blockingscenery.com/motefikagubamizovoxefsu8tm.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/2020_calendar_australia_printable.pdfIn PDF document text
    • http://vigastlens.xyz/adilakshmi_purana_kannada_movie_songs2ehiz.pdfIn PDF document text
    • http://instapresent.site/vcredist_x64._exe_2010_freerh88o.pdfIn PDF document text
    • http://nuxuzuruguli.mypressonline.com/la_caverna_de_platon_libro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5c0fd43d-d56a-4d97-a9a1-610543185b00/wendys_nutrition_6_nuggets.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/bijapibofapefagejivemim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/754ccc86-d065-45fe-a13a-c01017405b95/74076950206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/985b5801-84ee-4922-88ba-e4ee2a9145cc/7600730195.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/incentive_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b5fea4-0390-4000-a333-af017437c453/muladedilalimuxefi.pdfIn PDF document text
    • http://julukawava.epizy.com/cant_find_music_on_itunes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f5ee46-eab3-4f88-8504-7d114e13764d/85838609057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a85605-b129-4a4e-b29a-00f5f1de0767/77455066919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/169aaeae-a55c-4443-b62e-5a489c786566/76429584077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a6d336-8b48-4c60-8d1c-12243e493753/dd_handbook_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda3dae1-db9b-464c-9298-48a9c9acb021/74485600741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7204b0bc-1c22-4bd4-9422-a94225c04f52/74923227554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de971093-a814-4715-9a5d-ca7673adc95c/core_java_coding_interview_questions_and_answers_for_freshers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3eeee94-d2c0-49a4-9dba-d3b1626dc30d/biggest_stock_markets_in_the_world_2018.pdfIn PDF document text
    • http://kisolapuri.rf.gd/32374255397.pdfIn PDF document text
    • http://kexomuradalo.rf.gd/76127825323.pdfIn PDF document text
    • http://logovejewuwofe.rf.gd/linear_algebra_a_modern_introduction_3rd_edition_solutions_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc66eac-eefd-4f51-ae49-3770ee91020b/famepodozivad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd5d01e5-088c-4988-9540-06ff7e4e3cad/meaning_cycled_off.pdfIn PDF document text
    • http://sulenovigadi.myartsonline.com/spanish_alphabet_worksheets_for_beginners.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 5316 bytes
SHA-256: 61b89c99defdeae3cffc4f42f8e00a4099b38300fd38ebba5be4c4bb9978ff45
font_01_sfnt_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 10616 bytes
SHA-256: 8b789ab3ad7dc4126a12c6a1196babf3e57560e829d33b405dfb83715b5a374c
font_02_sfnt_off00011400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11400 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e