Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44c6ad54f184778…

MALICIOUS

PDF

75.2 KB Created: 2021-04-11 02:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b3e8d35f0d6c33f1f03c50a472947205 SHA-1: 64c8dafe8103f629dc1f926977c9545d6998af2a SHA-256: b44c6ad54f18477875f3e34fd42fc12bbcabe47cec331f7938ed393167db2e11
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 0.9998

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://kuzutuzo.ru/strik?utm_term=coding+apps+for+macbook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428054/normal_5fe8795f960d2.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/eC5hfzL/sojubepezewi.pdfIn PDF document text
    • http://roskycnmx.com/financial_accounting_books74d8x.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/berlin_criteria_ardsw300x.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/ggjhbgd/25355453614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_606369dda54d0.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/jadexodudorediputelan3tlyd.pdfIn PDF document text
    • http://fortuneo.biz/chocolate_peanut_butter_thunder_cake_recipegmbt7.pdfIn PDF document text
    • https://cdn.sqhk.co/wogirujut/diijjhb/77819824113.pdfIn PDF document text
    • http://itabody.space/dungeons_and_dragons_2e_players_handbooknyndj.pdfIn PDF document text
    • https://daily-dev-tips.comIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71fc3d66-43b2-4ae0-adc3-dfbcdf8b5360.filesusr.com/ugd/6605a0_15136ea244db4b20aea729f1df859414.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokit/who_you_say_i_am_piano_sheet_music.pdfIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_51d56e5083964ecbab52be97d65a5254.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesixefe/oracin_poderosa_a_san_judas_tadeo_para_casos_difciles_y_desesperados.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/gadikepupoma.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/moca_score_ranges_20_30.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/how_often_to_do_p90x_ab_ripper.pdfIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_62bb441067804f0aa3b107a717ca1bb5.pdf?index=trueIn 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_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 5552 bytes
SHA-256: b95e9bba0a2d688a50f1fb9f8fc2bc10a586a1f9ce57a129cc421bd0d1d61e1d
font_01_sfnt_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 10440 bytes
SHA-256: d0bde638fb15cfdf9835c10dedb40209c401d736eeb848976406b62c2d95c0ad

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