Malicious PDF — malware analysis report

Static analysis result for SHA-256 50da240238b79592…

MALICIOUS

PDF

76.8 KB Created: 2021-03-14 23:38:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5a996021450a14217ca16d294aadd475 SHA-1: b8b80b978c9bfbf2ab68a9e8c4bb3317dce2e99b SHA-256: 50da240238b79592ffe818efe1312416d2ea75046aeed753cab51b60965c6ac7
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 0.9998

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://mezovuduw.ru/wix?keyword=ap+environmental+science+math+answer+key PDF link annotation
    • http://itslm.fun/4068649020ayc5e.pdfIn PDF document text
    • http://life-news.tech/la_estrategia_ptima_en_blackjack_pdbb40s.pdfIn PDF document text
    • http://blancop.xyz/sojourner_truth_aint_i_a_woman_speech_summaryxt4pi.pdfIn PDF document text
    • http://chtotakoeverti.biz/bipixevonukojejawewex356y.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/46781689-7dd9-486c-bab3-9dde5f802358/is_it_legal_to_have_a_lock_pick_set.pdfIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_889370a8dcbf46258e4f4a488ce2b40a.pdf?index=trueIn PDF document text
    • http://rovuwuruw.epizy.com/85884768120.pdfIn PDF document text
    • https://f8b42b25-1d56-4c98-aefd-0f6888892395.filesusr.com/ugd/bae363_36691f91f7064e32b63d535ace6f7294.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vojapu/tappan_electric_stove_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb43686-c701-434e-8762-807da4435b71/73841858252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c446ab-6fd4-44c6-b823-bd3243d43bbb/how_to_set_up_behringer_xenyx_q802usb.pdfIn PDF document text
    • http://koxowasone.epizy.com/94324716939.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/answer_sheet_of_upsc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2032e9d3-69bc-4722-9386-2a48d68bd5c7/how_do_you_calculate_heat_flow_from_one_solid_to_another.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9c9ed4-26c6-4145-b5f1-44d98d284e5b/how_to_watch_call_me_by_your_name_on_netflix_vpn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d9e0a0-d287-4899-a1c1-6548754b8552/zinebavenebeduwuwikofapod.pdfIn PDF document text
    • http://zojimako.rf.gd/31540534490.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_e7b93b6a65344716aa3be80d22a655b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivamubug/manual_oscilloscope_lg_os_5020.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_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 5480 bytes
SHA-256: 8d5b4dc6d1f31a2539e7fb6b0146bdd99563abecb3cf10e1c822cbe2fada53a9
font_01_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 11808 bytes
SHA-256: f6ceef4ad4806c068f34cd47c4f4861ee4e56d6c6036cc78979e64fcf3425cc2