Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a20619dd6afed2…

MALICIOUS

PDF

77.1 KB Created: 2021-05-21 15:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: acd5a9e0bfb200df96c1f45db738f7da SHA-1: 72e45a9658f2c7f57e52a374307e1508f2ca1dbd SHA-256: 58a20619dd6afed2789a7ea91047a58726c35b7a876a48d1ae2128cdb299c0c1
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, dafemum.ru, which is likely used to serve a malicious payload. The presence of a "download button" heuristic and ClamAV detection further supports a phishing and malware distribution intent. Although no scripts were extracted, the overall structure and heuristics indicate a malicious document designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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://dafemum.ru/strik?utm_term=gun+shoot+strike+game+download+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4453100/normal_600f821e90ebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424347/normal_5fd6155344ebf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463264/normal_5ffa0e2025592.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408001/normal_5fcf212747856.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457561/normal_6005ca4106d0a.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/zoxewudunigus/icici_prudential_balanced_advantage_fund_fact_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/pemonuwevugolubuf.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/fitufisarexi.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/32339179743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f20bd3b0-e921-4c61-90d7-6fc1f0317626/zajuxorezudelonetira.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/4_month_old_puppy_feeding_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/54478866834.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/cdcms_report_module_login.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/personal_daily_expenses_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/markup_discount_and_tax_harder_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8dd8b00-ecb5-4958-aa15-b6b96e452312/fish_finder_rig_for_redfish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a444ac7-60d5-4f98-8023-2fd34a0fce1e/ncss_qualities_of_powerful_and_authentic_social_studies.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/white_rodgers_50a55-288_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/98437127593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac68a621-48a1-424f-a8e0-9c27fafb0916/recommended_books_for_11_year_olds_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86627041-0faf-401e-acbc-1936cb833f96/what_kind_of_bulb_do_you_use_in_an_oven.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/13404140613.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_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 5444 bytes
SHA-256: a622fca79de93f9bdcf6fdc39535f3c45e0afe34b4586cc55cf2715a34b21f76
font_01_sfnt_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 10496 bytes
SHA-256: d4ad706e60b260aa2276930a8a46a96e910a45534ddd98f58f709547539b39fa
font_02_sfnt_off0001186d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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