Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ef0162e364999a…

MALICIOUS

PDF

76.1 KB Created: 2021-04-04 10:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c6a83d77365b01d40365b0a10655be9d SHA-1: 2303474137accb6813d6acb9c947f94a0e4d71a2 SHA-256: 43ef0162e364999a80ebf36812ea6e808344064b38371dca9184ccbc3f228885
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the 'link farm' heuristic indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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 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://mezovuduw.ru/123?utm_term=to+infinitive+and+bare+infinitive+pdf PDF link annotation
    • http://train-home.ru/mail_merge_with_attachments_word_2016lvnu3.pdfIn PDF document text
    • http://igme.site/what_are_the_capabilities_of_data_mining_toolsnko6z.pdfIn PDF document text
    • http://joblanc.xyz/best_day_trading_books_for_indian_stock_marketwt909.pdfIn PDF document text
    • http://ourfanz.com/46321808575ci2vh.pdfIn PDF document text
    • http://ketotreno.buzz/55613798299ep78m.pdfIn PDF document text
    • http://faceit.su/visafefifaj3nbcz.pdfIn PDF document text
    • http://laulu-go.ru/raxogelavank1823.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/ariens_snowblower2yfdt.pdfIn PDF document text
    • http://buytoday.cc/is_cyberpunk_on_ps4_fixedvhk4k.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/5188042702.pdfIn PDF document text
    • http://alsamcctv.com/78970640587rv420.pdfIn PDF document text
    • http://tumbaa.space/17588871086wexni.pdfIn PDF document text
    • http://zuduwamani.mypressonline.com/gexokumawatijetokeperumu.pdfIn PDF document text
    • http://hookup755.fun/wazifalepenakokajaxup5h7r.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/97881675248.pdfIn PDF document text
    • http://koprovk.xyz/disujobimebofogumawh2nt8.pdfIn PDF document text
    • http://detonicufficiale.website/grand_princess_deck_planngnrf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pavafisufopu.myartsonline.com/35615388662.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_a2e1a5f02c2347f9a22e7324c40ce503.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_1953e22294664fa685f797742a6600bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f151c5d5-9f83-4b07-b6dd-c7fd7d81ecb8/lg_8_000_btu_portable_air_conditioner_with_dehumidifier_-_lp0817wsr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5faa859-d4f4-41b5-8d9d-5fd73839f74d/how_to_fix_a_leaking_badger_1_garbage_disposal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fdfeddf-6fb1-4bfc-9327-757e697f20c1/48349817179.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_e38eeb189ca4488196b32d9238f24b84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21803d71-ef92-4209-8c16-c3cb0f77e0f9/acsms_resources_for_the_personal_trainer_5th_edition_ebook.pdfIn PDF document text
    • http://wusozupit.myartsonline.com/xezaxogaxoga.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_94d4ce88c486474db0d75063f8297a5f.pdf?index=trueIn 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_off0000e91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91D 4972 bytes
SHA-256: f0b2b3acc9d54f7044da22e95248036a5ac9ab8d8f169ba086a820e1ab952df2
font_01_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 11536 bytes
SHA-256: d738fc33cd3c35f3761fa0299644f02f3986646a2ab6318a7ece3fdc667ca7f0