Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c24cfdc4714c56…

MALICIOUS

PDF

73.9 KB Created: 2021-02-14 22:02:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0f6a28abd61cfe586bd5e529f639ef7e SHA-1: 0306a378c3c08f5b4024171ec08b753914841152 SHA-256: 51c24cfdc4714c56c48df5d852937cec8a2f58a6e698aea07423f3aecdcd4769
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm or SEO spam. The heuristic PDF_SEO_LINK_FARM specifically flags this behavior, indicating the document's primary purpose is to direct users to a network of other sites. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely related to phishing or malware distribution.

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://druttle.ru/aws?utm_term=finding+slope+worksheet+grade+8 PDF link annotation
    • https://gofuzuxelizexo.weebly.com/uploads/1/3/5/3/135391542/4171201.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/wfihcjd/best_retro_style_games_on_switch.pdfIn PDF document text
    • https://pudomawiwo.weebly.com/uploads/1/3/5/9/135958378/6264231.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/b2SvCFY/foxupiwo.pdfIn PDF document text
    • https://cdn.sqhk.co/subogutaze/dgcBWnE/table_tennis_masters.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/sakaburepagase/ielts_test_report_form_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/bubble_bird_game.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/76195106950.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/in_formal_letter_english.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/28058884344.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/89904000711.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/antivirus_app_for_android_tv_box.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/shell_advance_ultra_4t_15w-_50_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/gagevujak.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/anbanavan_asaradhavan_adangadhavan_bgm_ringtones_free.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/good_morning_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/bapetifusifawugad.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_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 5524 bytes
SHA-256: a271f0f20674fe6df7ee9321858ea46d58b1249a4dde1b94b21db5da7a617642
font_01_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 10424 bytes
SHA-256: 219a2fad41cc0e89d58872a56c00cfd1df12044bb937060428e558d17ecf3fa6

Open this report in the interactive analyzer, or submit your own file for analysis.