Malicious PDF — malware analysis report

Static analysis result for SHA-256 5633221f423de28e…

MALICIOUS

PDF

82.2 KB Created: 2021-02-26 22:03:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 68f82b9d0690351275df92c108fe842c SHA-1: c7f876250f71eb7c2cbe3bc09381c90f85448e0e SHA-256: 5633221f423de28e22cfef835800efa9d8b33fb5eaa4ebb8cd31ffe80d587e94
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to contain text related to search queries, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/123?utm_term=how+to+remove+battery+from+armitron+watch In PDF document text
    • http://viniveba.mywebcommunity.org/sijeweviraj.pdfIn PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/4477182.pdfIn PDF document text
    • https://menafove.weebly.com/uploads/1/3/1/4/131438456/9749891.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/relative_location_of_perth_australia.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/star_and_marcos_guide_to_mastering_every_dimension_stump_day_edition.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/bifadimuwabunojax.pdfIn PDF document text
    • https://litokotivugobud.weebly.com/uploads/1/3/2/6/132695550/xapuwuzikizi.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/gedesegurorukes-sakudomasesemis-dofiwosotoser-ravarawogukug.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/jagux/all_star_wars_movies_free.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/change_navigation_bar_size_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/48361491374.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/admango_ad_spend_report.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_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 5056 bytes
SHA-256: 84e8b32d58bfaa83d357da8b490136d8653e8e5426a186ac10c89b623dce3c4f
font_01_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 10584 bytes
SHA-256: e52958a420e36f50362b1fe7d3a23a7fc45808212ae36f514692db8cee2361f7
font_02_sfnt_off00012dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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