Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58fec4b53b0b3dc…

MALICIOUS

PDF

74.1 KB Created: 2021-02-21 21:14:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2a1abcdbe4e8b808d1320a11c366819d SHA-1: 5e56f81950fb9d23ba3f635299803c348bb24c20 SHA-256: d58fec4b53b0b3dc04a6c37f044dcccfa97776db5a92140b52651828be996a59
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 0.9996

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/123?utm_term=what+is+esselstyn+diet PDF link annotation
    • http://semengergel.ru/super_smash_flash_2_6969586zr.pdfIn PDF document text
    • http://creditinquiry.info/wawagulixadokatasiforafab7nos.pdfIn PDF document text
    • http://hempmap.ru/bovekagofufet8e4ke.pdfIn PDF document text
    • https://wamazuwo.weebly.com/uploads/1/3/1/3/131380988/nejevegu.pdfIn PDF document text
    • https://wuzinetasinozud.weebly.com/uploads/1/3/1/6/131606123/lemabeja.pdfIn PDF document text
    • https://mebusogaduvorit.weebly.com/uploads/1/3/0/9/130969439/3034448.pdfIn PDF document text
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/4153ec.pdfIn PDF document text
    • http://kojurebajalafaw.22web.org/simple_cv_html_template_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://risepaxazitomep.rf.gd/55859673238.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/how_many_diary_of_a_wimpy_kid_books_are_there_in_order.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/braun_series_7_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/82012462122.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/babul_meriya_gudiyan_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/tozivudegelolugoro.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/nursery_school_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/dauntless_beta_size.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/38915029067.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/fevufefavakutafajekivi.pdfIn PDF document text
    • http://kawuduzan.rf.gd/rojenebulepapawosavi.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/ironing_sheets_with_a_steam_press.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/72240259230.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/sharp_aquos_board_user_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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 4932 bytes
SHA-256: ec478fdc6cbca24380bd2117adcdafec4c734d95b9d572d22cf8c257523c5e87
font_01_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 11020 bytes
SHA-256: efcc17cc6e264f4eda7f0dd700b1a12e09548f5be4516b9019a0b5b7af3f3bd3

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