Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac43ce7b8eed55e1…

MALICIOUS

PDF

83.3 KB Created: 2021-04-06 21:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 061bca9bd7b242b3ebeb0900eb384055 SHA-1: 51d6bf82fc3a5d32ac51824957227fb386a1f2b2 SHA-256: ac43ce7b8eed55e1a23c7ad04e8ae3e93fc401cf75754ec95b2324521d68ffc1
156 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 0.9990

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 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://dugedepap.ru/award?keyword=google+docs+pdf+blurry PDF link annotation
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/zixujopejaxexapisas.pdfIn PDF document text
    • https://cdn.sqhk.co/gituxogud/gLidhjz/zemerapop.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/jixis_lawer_ranurekinagu_bozamogekigamu.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/fcRShep/tijogujerurogevama.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/dTjchb1/67531516535.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/hd6idyq/evoland_switch_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/cchiifU/80035887070.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/idRjcjd/ceqa_guidelines_section_15064.pdfIn PDF document text
    • https://cdn.sqhk.co/debefuki/vKmZjeW/my_first_100_words_flash_cards_kmart.pdfIn PDF document text
    • https://cdn.sqhk.co/fixijolexap/icgj7Ir/national_boss_day_the_office.pdfIn PDF document text
    • https://cdn.sqhk.co/dekorasenu/jfhdrie/75225352946.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/gowupuzokowuxes/how_to_paste_picture_in_google_search.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/cuanto_es_1_49_pulgadas_en_pies.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/3079843941.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/sundance_optima_850_spa_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/84152046998.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/what_is_memo_and_its_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/73274061511.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/phone_interview_preparation.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/76484822082.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/hi_point_c9_holster.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/zemur.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/84337760599.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/plantronics_voyager_5200_uc_bluetooth_headset_system_b5200.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 5388 bytes
SHA-256: 30a5813934b2f503252f13f9c2cc23b539242152c64603d29934a1afda16883d
font_01_sfnt_off00010585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 10540 bytes
SHA-256: a4326f85d7455cc6902f02abdeff8fa56a3451c770f7e6a91a55f288729ee66f
font_02_sfnt_off000129e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E7 16388 bytes
SHA-256: a4f616c8ed03231f927c8f6725ddfb6aed79ba1e9c0c9257d690ec40f184d4cc

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