Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde403fef4ed7838…

MALICIOUS

PDF

86.0 KB Created: 2021-03-18 10:08:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6b5d2472147bcf1319a137635d6f6e5f SHA-1: 88502ecbac3b1316262a8a9e2fe29ab1ce205d6b SHA-256: cde403fef4ed78380c6b1d771486d8d0491cde4504b1b92c1b3bec95385e708b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://vilenefex.ru/wix?keyword=amoeba+sisters+video+recap+genetic+drift+worksheet+answers', suggests a lure to a site that may host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=amoeba+sisters+video+recap+genetic+drift+worksheet+answers PDF link annotation
    • http://prizinsta24.space/kevin_love_injury_report_rotoworld8ehh3.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/f3ihYct/healthy_road_trip_snacks_trader_joes.pdfIn PDF document text
    • https://berovifis.weebly.com/uploads/1/3/4/7/134730871/6619299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_601d41a5c6c07.pdfIn PDF document text
    • https://nogudoge.weebly.com/uploads/1/3/4/0/134017621/surefamaxozida-sakefufok-fikorademofo.pdfIn PDF document text
    • http://micrometerdigital.xyz/dell_2001fp_ultrasharp_20_lcd_monitor2s668.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/Iyohfih/the_36_strategies_of_the_martial_arts.pdfIn PDF document text
    • https://cdn.sqhk.co/noxomosanena/7HB5BGQ/head_basketball_coach_at_howard_university.pdfIn PDF document text
    • https://cdn.sqhk.co/fadejiweruw/yHHgfwb/woxazamizetujufuvunojivoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529281/normal_5fdab720cc4df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419654/normal_5fced9b4bfa69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391621/normal_5ffec23511d1e.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/robumuduluwise/zibu_angelic_symbols.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/nelef.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/29343432880.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/sheetz_job_openings_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/how_to_use_sodastream_fizzi_one_touch.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/crossfit_games_20._2_score_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/biriyani_songs_320kbps.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_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 5884 bytes
SHA-256: 3219471c4e24f7841d569bd0589415fbdd54344814d7004aca5279355fbc502a
font_01_sfnt_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 11080 bytes
SHA-256: 272d276cac24bd155a98b64a528cb2e7405215cf45e25ce9cc3faf62c946eddd
font_02_sfnt_off00013494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13494 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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