Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c3fec00cb7985c…

MALICIOUS

PDF

78.5 KB Created: 2021-02-21 18:54:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ab1cc6450d31ce1c25e9bdc73e2b1b1a SHA-1: 2db67b19fa14cc92061ae61ed12da7fc872612ba SHA-256: 99c3fec00cb7985c4ad393e5cf4abf7d01818929e7ae27bd7194019eed215407
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9999

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://bologen.ru/123?utm_term=hp+stream+11-ak0000na+laptop+review PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369774/normal_5fdf600ab9923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458824/normal_5fe2ecb3611c4.pdfIn PDF document text
    • https://cdn.sqhk.co/rinovizifim/jEnv8JP/4_pics_1_word_level_1811.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/BFjeaDe/telegram_web_not_opening.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/icfJjbm/ringtones_for_iphone_5s_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383445/normal_5ffb283cf0d78.pdfIn PDF document text
    • https://nadenekaf.weebly.com/uploads/1/3/0/7/130739264/2483073.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/xegemibijize-fuxeneberef.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/gfhbZif/61528805789.pdfIn PDF document text
    • https://kulegireketo.weebly.com/uploads/1/3/5/3/135325025/jipomot-mobij-xudut-xesawufepatame.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447906/normal_60038724cce8d.pdfIn PDF document text
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/3e8e8afbceb6d7a.pdfIn PDF document text
    • https://cdn.sqhk.co/wefopijupe/jdDhjgT/infected_soul_datafilehost_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/wevodapobu/asuRQjj/paint_by_numbers_michaels.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/afTaje1/amazon_alexa_echo_dot_3_setup.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/xenavuxa/bering_sea_gold_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/dobuxedibemeluzuti.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_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 5368 bytes
SHA-256: e1eff44a126a6c882fd70429e0a77f3e6a83ee1407ef66c91d8ab6d048eaa9fb
font_01_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 10620 bytes
SHA-256: 8f4a5ee526e0c62b0594d122386c69f5fa61b8173b74aa24384eee7d127b594c

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