Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22e35186a05f4c1…

MALICIOUS

PDF

82.4 KB Created: 2021-03-14 03:59:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f709dabaf3c52007f584559f6300619b SHA-1: f179e13fec3688ea548214039cb0f4478130fe43 SHA-256: c22e35186a05f4c155cd45f6e140a79a7acd64ae1a33eaa29b57226f7399f236
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'jacksth.ru' which is flagged as a potential link farm. ClamAV and ML classifiers identify this as a phishing or malicious PDF. The presence of embedded URLs and the structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/award?keyword=capitalization+worksheet+grade+2+pdf PDF link annotation
    • https://cdn.sqhk.co/kakezesarop/ijnCij4/52457054284.pdfIn PDF document text
    • http://epaytds.xyz/tusovujopuo465.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/Tjehhhe/knights_templar_symbols_and_their_meanings.pdfIn PDF document text
    • http://ctyr.ru/kill_shot_bravo_download3bxds.pdfIn PDF document text
    • https://telapawuwa.weebly.com/uploads/1/3/5/9/135964826/3156480.pdfIn PDF document text
    • http://robertferrell.net/vba_programming_for_beginnershtonx.pdfIn PDF document text
    • https://kogekotosejikol.weebly.com/uploads/1/3/5/4/135400664/samojoxopisokep.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/busutofukeki.pdfIn PDF document text
    • https://tajamexuzoxobug.weebly.com/uploads/1/3/1/4/131410736/xoguvevezukig.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/fSokPzO/96016113156.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/SUejdG0/aaa_auto_insurance_quote.pdfIn PDF document text
    • http://drilltech.info/wukawufaxegiwus4yk1u.pdfIn PDF document text
    • http://opendouche.xyz/prefixes_and_suffixes_list_in_urduthgvf.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/lgchjZp/dune_book_christian_review.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/sefabe/the_blind_side_vietsub.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/jamasubawelapizoxajawavub.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_3f3880d5b1a647b1a0c948536497b558.pdf?index=trueIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_6465a879c7a64367ae0ce296432aa167.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ligole/how_to_change_settings_on_safety_1st_thermometer.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/livros_espritas_grtis_para_baixar.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/aver_vc520.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/android_studio_logon_service_not_running.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/rifazonozewijobulitegaduv.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_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 5548 bytes
SHA-256: 4d54d588e7358df1d73bd68a1254aa9f17812d422fe92b26a2a047e93d35b228
font_01_sfnt_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 12024 bytes
SHA-256: e1082d9e5b48c6b4efddf2372175126415e1b96261e28ead16c4673c6ee82bfa

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