Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcea3e2872f1563…

MALICIOUS

PDF

120.2 KB Created: 2021-03-24 20:39:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7104b8ccac0dad8ff69aaec48d448c76 SHA-1: 16a3b4523ba7b94775c8f3113d8abafb1a856530 SHA-256: ffcea3e2872f1563cce98bf8318871b2bce27fb0924c4dd5e9c1cbcd7f206cee
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://crophysi.ru/123?utm_term=uncomplicated+uti+idsa+guidelines PDF link annotation
    • https://fekanarikivokil.weebly.com/uploads/1/3/4/8/134884633/74699f.pdfIn PDF document text
    • http://zuvalasit.mypressonline.com/modal_verbs_exercises_a2.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/70762544842rm25y.pdfIn PDF document text
    • http://palopepidek.mypressonline.com/90224110109.pdfIn PDF document text
    • https://vabakapis.weebly.com/uploads/1/3/1/4/131453405/fovevi.pdfIn PDF document text
    • https://jejepijukutu.weebly.com/uploads/1/3/4/1/134131362/a0cc8a75281.pdfIn PDF document text
    • http://detonic-italia.website/how_often_to_clean_ruger_sr22pqabq.pdfIn PDF document text
    • https://cdn.sqhk.co/gasariba/iaoUMvr/mebarizaf.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/what_does_seeing_the_number_600_mean.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423772/normal_5fcbd0395b23b.pdfIn PDF document text
    • https://zetaxufonepijak.weebly.com/uploads/1/3/4/3/134353616/zibod.pdfIn PDF document text
    • https://cdn.sqhk.co/zugivakizo/jJ87wid/najirovudulineworu.pdfIn PDF document text
    • https://fedalovojuxunod.weebly.com/uploads/1/3/0/7/130775560/dusajakumowu.pdfIn PDF document text
    • http://giftcard-sale.store/sled_driver_brian_shul5eqpy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_604e36a337d58.pdfIn PDF document text
    • https://dosedoduni.weebly.com/uploads/1/3/4/3/134347632/101822.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzevunoxina/0hf1kia/checklist_table_powerpoint_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fidegaf.atwebpages.com/40720162242.pdfIn PDF document text
    • http://zagofij.onlinewebshop.net/tatasaxesufu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18448 5288 bytes
SHA-256: d748b54d6849853d9a3e30108c356e2c91e05d4f4eeb1ca5c19f5c37ce99381d
font_01_sfnt_off00019637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19637 11408 bytes
SHA-256: 62b6a35e8bcd36f8d313a466dc3db8a5f8b5791e9c3cb44aee60daf8917fd338
font_02_sfnt_off0001bd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD8B 16148 bytes
SHA-256: 98bbda09e34957c2c47eea570891e411fa41ced272e9777bbef021ce7395b75a

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