Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa05c70e6a8ff0bd…

MALICIOUS

PDF

72.4 KB Created: 2021-03-02 23:11:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d7e29c9ffc08c37868e8e216ddb70f4d SHA-1: 56791c857dfbf4316c337aba8b9a73035e728fab SHA-256: fa05c70e6a8ff0bd833bb526131775de71e54793d7ca1a6a2585b2d74eb6c334
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are likely part of a link farm designed to obscure the true destination. The primary URL, 'https://bologen.ru/strik?utm_term=arm%2527s+reach+co+sleeper+folding+instructions', suggests a lure related to product instructions, likely a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and numerous external links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=arm%2527s+reach+co+sleeper+folding+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365576/normal_5fdec8743987a.pdfIn PDF document text
    • https://rifivubego.weebly.com/uploads/1/3/1/4/131407021/1418270.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/EdoLjgb/baked_catfish_recipes_without_cornmeal.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/whirlpool_cabrio_washer_error_codes_ul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403129/normal_603c1715350dc.pdfIn PDF document text
    • https://gezumadugoviful.weebly.com/uploads/1/3/4/6/134611133/jofelojumokefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_5fe79de40e2b7.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/gijhqhf/yellowstone_season_2_episode_1_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_602e25985d0ef.pdfIn PDF document text
    • https://suzexefovewav.weebly.com/uploads/1/3/4/6/134640410/wokezofume_lumudajuwe_gijunivijok_volem.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/5085946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420029/normal_603d0a8e5aa78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_5fd2283411617.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/zevutebulaworel/blank_fax_cover_sheet_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/google_assistant_keeps_popping_up_android.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/laxopiwixi.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/beats_by_dr._dre_-_beats_studio3_wireless_noise_cancelling_headphones_-_gray.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/how_to_clean_keurig_2.0_water_filter.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_off0000dcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD6 5592 bytes
SHA-256: d9517c34376a6ddc0f4f4b9585bcad40944d63305c0c0673e26b7af17a624cdb
font_01_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 10152 bytes
SHA-256: a363022efbaf7f05242ba4dd3c5ed52bba5533319076da6315933bc00fd5a54a

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