Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5f41bb6c6643ac…

MALICIOUS

PDF

76.5 KB Created: 2021-02-24 10:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c5245763549970159e9622b11a867951 SHA-1: 9e0009eeeb804c140b71e214d72b3db84038fc02 SHA-256: 9a5f41bb6c6643ac7459bc2174ef55ceaac323d7f2b638a8b3eb2e7116ce7a13
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=how+to+text+someone+who+is+stressed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446915/normal_5fdb14c668af2.pdfIn PDF document text
    • http://podeves.xyz/wevikivadevakokegesi6k2i8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471253/normal_5fda1aa47683f.pdfIn PDF document text
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/jofiw.pdfIn PDF document text
    • http://introdom.ru/71606839543fkpei.pdfIn PDF document text
    • http://vikorurapufor.iblogger.org/1080p_video_converter_apk.pdfIn PDF document text
    • http://vobigabifinu.22web.org/12011927122.pdfIn PDF document text
    • http://italywom.space/android_studio_bottom_navigation_bar_activityxa34a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_5fd2460a42e46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370090/normal_5fc7b53a74b63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_602e72a47667a.pdfIn PDF document text
    • http://profapp.pro/86873317803c13sr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420902/normal_6014db1451284.pdfIn PDF document text
    • https://wifamiwipefap.weebly.com/uploads/1/3/0/7/130738562/tamorox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dimegebewode.epizy.com/dictionary_for_windows_10_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/gegejozu.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/oh_baby_girl_tamil_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/chamberlain_liftmaster_professional_1_3_hp_manual.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_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 4944 bytes
SHA-256: 42d82cf3dd7941e94150fc5dfcdfabc6f7db340c1d612bd31ec754e0c3bfacb5
font_01_sfnt_off00010160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10160 10372 bytes
SHA-256: 7b93712a2baf693794bd5140eb11f3bad180bd57dfae81555765302761e16dbb

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