Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1044cd6ff045c7…

MALICIOUS

PDF

67.4 KB Created: 2021-03-20 17:42:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 817a512d1a08993ed07809ecad9b5743 SHA-1: 5eace27d0700af0a36d64a14ef843231165ade64 SHA-256: aa1044cd6ff045c7bb9731c6e6671329380de3e19bc3fec9c8410e689b19fa1d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution lure. ClamAV detection and ML classification confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://soxebez.ru/wix?keyword=unit+vii+worksheet+4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451927/normal_602e360e2b37a.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/download_foxit_reader_gratis.pdfIn PDF document text
    • http://jitokinut.iblogger.org/sika_anchorfix_2001_data_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475725/normal_5fcb292a0ce35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422135/normal_5ffe55aeac0ac.pdfIn PDF document text
    • http://mosoxiliraf.iblogger.org/basisofowolalerapujitavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390638/normal_60166d33602ed.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/weber_gas_grill_320_parts.pdfIn PDF document text
    • http://pejagepelif.iblogger.org/guzojezuju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_602d6b8ef06a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421207/normal_5fed120672771.pdfIn PDF document text
    • http://xatovapotogu.mywebcommunity.org/lokuk.pdfIn PDF document text
    • http://xivazokib.medianewsonline.com/rimidobokejikik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_6049b4bfb5066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489980/normal_6039e33d25fd6.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/setikizo/free_time_activities_printable_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/darkness_rises_wizard_skill_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/17457376925.pdfIn PDF document text
    • http://dugukob.rf.gd/niroparunugikajera.pdfIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/xatatunimajova.pdfIn PDF document text
    • http://sasisoxebejinap.rf.gd/how_to_describe_a_bright_sunny_day.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_off0000cd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD10 4824 bytes
SHA-256: d60f83a61117a506a77c94684838a2e98f1ee0afbfd65d7065e98540d750ff92
font_01_sfnt_off0000dd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 10260 bytes
SHA-256: 05f0c6e988006131ddd712bf65adb99efac278bd5f98adb495feaddfe60dfce7

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