Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ecbc4214954a0d…

MALICIOUS

PDF

75.0 KB Created: 2021-02-08 08:16:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 36d1acffcbf5e661bd25aabd2f45397e SHA-1: 862a395fb9b191d793b9711958a8d37fce4af4ef SHA-256: 38ecbc4214954a0dec2328c4c0c8fa7fbf1fdad666482c79b44a179695006298
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The presence of a 'download button' heuristic further supports a phishing or malware distribution attempt. The primary malicious URL identified is https://crophysi.ru/aws?utm_term=game+guardian+mod+apk+versi+terbaru, which likely serves as a lure for downloading unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/aws?utm_term=game+guardian+mod+apk+versi+terbaru In PDF document text
    • https://lavolobaned.weebly.com/uploads/1/3/0/7/130740571/mixegogegigifedeneme.pdfIn PDF document text
    • https://mazerobuwi.weebly.com/uploads/1/3/1/3/131398334/wulinoro_bibedunizilifip_jabewa.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/5415894.pdfIn PDF document text
    • https://cdn.sqhk.co/tizesefetus/ahbfFje/the_chosen_book_2_taran_matharu.pdfIn PDF document text
    • https://kasezikibojeg.weebly.com/uploads/1/3/1/8/131871727/8004781.pdfIn PDF document text
    • https://vomerigovelaj.weebly.com/uploads/1/3/4/9/134901888/zowinipotuzulavi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jeromopelurab/jorofupaxisol.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/jisoxorogubuzujov.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/grade_2_english_comprehension_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/baal_veer_games_online_play.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/perform_ad_hoc_projects.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/eclipse_free_for_windows_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/7335116676.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 5424 bytes
SHA-256: 6b614ae28f82029930dbaa194b6fb8ab7318235ff12165738cf3e929774467fd
font_01_sfnt_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 10544 bytes
SHA-256: 2bd357d293d17ec5ba6221d477a994c691219b496615b41f0a925be48062ca14
font_02_sfnt_off00010f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F36 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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