Malicious PDF — malware analysis report

Static analysis result for SHA-256 1533e2b88079aa8e…

MALICIOUS

PDF

71.1 KB Created: 2021-03-29 00:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6d8b688be30850fb5bcf331bcbeda46b SHA-1: c9901bb6e35223344703efaa3108c662bb60a448 SHA-256: 1533e2b88079aa8e4897485fe9a61fef795e13ef13b4c9f45b416922cc46aba4
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 0.9996

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://dugedepap.ru/wix?keyword=fb+lite+apk+latest+download PDF link annotation
    • http://fredo.run/powerpoint_templates_business_ideaz3g1l.pdfIn PDF document text
    • https://gomepenet.weebly.com/uploads/1/3/0/8/130874128/zinobiwawizufem-bofimefowudavi-mimetolurop.pdfIn PDF document text
    • https://xizovetezewo.weebly.com/uploads/1/3/2/8/132814166/0518910856f6e7.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/zefipifas_weginowirip_merenan.pdfIn PDF document text
    • http://hayatevesigar.online/million_dollar_habits_book_stellan_moreira0qnvw.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/bowamekaniniwivamowo.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/archinteriors_48.pdfIn PDF document text
    • http://trokot-tonirovka.online/sharp_lc-24le175m_factory_resetrb6om.pdfIn PDF document text
    • http://vawadofofasip.getenjoyment.net/41583653060.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/mechanical_keyboard_switchesemxao.pdfIn PDF document text
    • http://fumuponi.22web.org/wynk_pro_cracked_apk.pdfIn PDF document text
    • https://betixajivuf.weebly.com/uploads/1/3/4/9/134900014/2f2841.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://junaken.onlinewebshop.net/77824071161.pdfIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_0518a8c5fe114be0a38ad458e8020714.pdf?index=trueIn PDF document text
    • https://3c3bf0af-c02c-43ee-ab56-a2e3f1f4987d.filesusr.com/ugd/97f7bb_b8810ea97d594405b65af232763f8c9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43458922-3c99-4257-b6c8-fd4a7da26049/how_to_cite_online_news_articles_in_apa_format.pdfIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_b22fb58cd52d44a88439cd87bf3aec84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e26ec0-693c-49c9-bc6a-bd1ab646e456/garmin_etrex_10_outdoor_handheld_gps_navigation_unit.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_d6b4b4f4f717467bb6926514aa9f2ab3.pdf?index=trueIn PDF document text
    • http://refipazak.epizy.com/amrita_nayak_odia_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ad1aca-99cf-469a-abff-0201ca50f44c/how_to_adjust_carb_on_husqvarna_460_rancher.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_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 5108 bytes
SHA-256: d74e0fdd2e4b3c0daf0b11332c260bb98feb977dbb87948c0e8f08467a66ea56
font_01_sfnt_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 10436 bytes
SHA-256: 1f1099a3f3a12953bb45c179bb75832c0e8ee2da8d2c7c978f5d2ad766ff7cba