Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0caf7661082e231…

MALICIOUS

PDF

170.8 KB Created: 2021-03-28 13:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 135e598b5c4210f154e7450164b93984 SHA-1: e92b21a9ae55b04e66382bfe20a50a20e3c0b4d5 SHA-256: d0caf7661082e2319922a33f83de0006c4dfe7ba016791baeb247e7aa900d21a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous external URIs and embedded links, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure and instructions for a password-protected archive further indicate a social engineering tactic to trick the user into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/strik?utm_term=ms+project+2013+for+mac+free+download PDF link annotation
    • https://cdn.sqhk.co/jegamaxegev/eqmhgFm/kogefeni.pdfIn PDF document text
    • https://cdn.sqhk.co/zugeketinog/4WNqKyS/red_button_quilt_company.pdfIn PDF document text
    • https://cdn.sqhk.co/rarinuva/cl56hen/86748583120.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/journal_entries_questions_for_class_11_with_solutions_in_hindi.pdfIn PDF document text
    • https://cdn.sqhk.co/zafilivopupu/kic5Vhb/wavawojepotivepofuwix.pdfIn PDF document text
    • http://kugamuwefula.iblogger.org/15824654925.pdfIn PDF document text
    • http://juzajikadig.22web.org/worship_songs_2018_audio.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/93444925553.pdfIn PDF document text
    • https://cdn.sqhk.co/lebereme/ggGghhe/felofoledepagonupifo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bezepegu.epizy.com/7638374965.pdfIn PDF document text
    • http://tevefetilojas.atwebpages.com/vopawatemu.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_421bc7d353af416eb2b96900b8f6fb2d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5576f08-ab2e-48a4-b538-8e6ec096d274/tobugi.pdfIn PDF document text
    • http://rabuxudizuxu.epizy.com/wijevax.pdfIn PDF document text
    • http://mozilerinalut.epizy.com/pejuvu.pdfIn PDF document text
    • http://dosatetirudipu.epizy.com/diretriz_asma_2020.pdfIn PDF document text
    • http://butazajoru.rf.gd/winrar_32_bit_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c60c149-56d7-403b-a93b-205ef1332d03/46122518711.pdfIn PDF document text
    • http://bisanake.rf.gd/37953126819.pdfIn PDF document text
    • http://javolijokexike.epizy.com/donkey_kong_64_levels.pdfIn PDF document text
    • https://4fd47d7d-96cb-4cdc-943f-55997d715fc9.filesusr.com/ugd/ab3424_3bf38714b5fe4c428bf09d55535cea6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe0017f-69f2-4492-b56f-cf267235ce62/kobalt_26_gallon_air_compressor_manual.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00027603.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x27603 21652 bytes
SHA-256: ccdd00af956acf3067a801f62b3b9fc9bf09a81d73ec67ed633ac282994b8eb2
font_00_sfnt_off0001f1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1E5 21148 bytes
SHA-256: a3e31b515af466faf30264ec7a323b01768907c39f05efb40eff0191594ab53d
font_01_sfnt_off000235cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x235CC 5964 bytes
SHA-256: bf732712f2d2881fcc26c91e1dd73e5663c76cf1fbc33a0ae953e52023a5a921
font_02_sfnt_off00024a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24A2B 13104 bytes
SHA-256: 1c0c5c166b0408492720f9de0ccbd267fb4d34521ef3cc8340ca2988472175dd

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