Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a9ef8954c0860d…

MALICIOUS

PDF

83.2 KB Created: 2021-02-03 02:38:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dbbfde79669fd7e1c699389f58cb1c9e SHA-1: d7ce375f64bd4411f3e37a9859e281add64dcd7e SHA-256: a1a9ef8954c0860de418a497772c61aefc95afaa2bc7479610bb3fbf3c6233bd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://leonvi.ru/123?utm_term=burnet+woods+post+office PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471960/normal_5fd660dda174e.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/ibF2jca/the_trip_to_greece_movie_soundtrack.pdfIn PDF document text
    • http://albatros-trans.ru/vaxafomaviwuzxuaft.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/fjfoidl/12707496847.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383132/normal_5ff17d4ab027f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380395/normal_5ff182ac987da.pdfIn PDF document text
    • http://mishabelle.ru/pabusofusumonalekafok8hqvt.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/ZbjaZjd/22831902217.pdfIn PDF document text
    • http://loxapul.iblogger.org/backcountry_tamil_dubbed_movie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450421/normal_5fc8750d3a30b.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
    • http://zerujafulo.rf.gd/majovojavilipozekowabux.pdfIn PDF document text
    • http://rewerikipij.rf.gd/trumpet_voluntary_john_stanley_sheet_music.pdfIn PDF document text
    • http://letugupinuvanu.rf.gd/56939295397.pdfIn PDF document text
    • http://lenegimuni.epizy.com/dulowogatopakomebek.pdfIn PDF document text
    • http://deketinak.rf.gd/far_cry_new_dawn_weapon_crafting_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 4932 bytes
SHA-256: bf40d00a243b1c211db042a5637bba22668ed560d638ac8dafd2b36edff5e8d3
font_01_sfnt_off0000f581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF581 11708 bytes
SHA-256: 0e4ab0b945a1486046448c8c9e3e446f01836b8e8c4e0039af7ddff9a176f772
font_02_sfnt_off00011c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off0001313e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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