Malicious PDF — malware analysis report

Static analysis result for SHA-256 0671748c981de747…

MALICIOUS

PDF

77.4 KB Created: 2021-03-29 23:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4884acd09798fdfc083808fb21220d5f SHA-1: c3fe018c5505b0e4a1d1c431b925cfa1f07e31e0 SHA-256: 0671748c981de747ece38e250e353cf1ab66303076c890ba8e1274a0b65a72e4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing with 'powershell_in_a_month_of_lunches_4th_editionqq6hd.pdf' suggests an attempt to leverage system commands, likely for payload execution or further compromise.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/award?keyword=functional+testing+tools+pdf PDF link annotation
    • http://leririv.sportsontheweb.net/sindrome_de_asperger_2020.pdfIn PDF document text
    • http://pabixigenived.22web.org/human_centipede_full_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379614/normal_6050731f98af5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455185/normal_5ff7c2f2f2075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377662/normal_600057c1c10c9.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/bChjicz/67383696028.pdfIn PDF document text
    • http://cashbackmoney.info/live_sports_hd_tv_apk_firestick4ffbi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_601cda30c7a11.pdfIn PDF document text
    • http://bavakobo.iblogger.org/nespresso_aeroccino_plus_milk_frother_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/hjaugiN/toolbox_talk_topics_construction_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365638/normal_6001b9b4146d9.pdfIn PDF document text
    • https://cdn.sqhk.co/mumeriretepi/ieP07So/run_android_application_on_mac.pdfIn PDF document text
    • http://mesikigodijope.mypressonline.com/5179078791.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/e4Fgjgg/samsung_gallery_app_download_for_android_mobile.pdfIn PDF document text
    • http://sallles.ru/powershell_in_a_month_of_lunches_4th_editionqq6hd.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/lnjigid/18997447719.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fapaga/lisd_middle_school_course_description_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/bosenubegepevuve.pdfIn PDF document text
    • http://lavapokapajemob.myartsonline.com/warhammer_40k_tyranids_codex_7th_edition.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_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 5184 bytes
SHA-256: d8621d8acbe6865001b1baef48f4410d9fc6bce3b2b258a5ccf521ad9722036a
font_01_sfnt_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 10824 bytes
SHA-256: 2562a4ef2018db67f110bdb5f12076e5f092e02e1818e40378c43e64a227719e

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