Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dfa3fdb5f4aeb3f…

MALICIOUS

PDF

107.8 KB Created: 2021-03-21 23:39:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 23d1e04de6852424e670640f0d03a403 SHA-1: e97b71a731053a159ba0b11bf20777360e1518fd SHA-256: 2dfa3fdb5f4aeb3fe0708efdef52fcab818daedd1081d2ee672a4361299cdad6
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 0.9997

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://maypoin.ru/award?keyword=weighted+arithmetic+mean+pdf PDF link annotation
    • http://mexawolin.medianewsonline.com/ameer_khusro_kalam.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/f8DrzUl/microsoft_sharepoint_2016_designing_and_architecting_solutions.pdfIn PDF document text
    • https://wojizenufojanog.weebly.com/uploads/1/3/4/7/134724603/nefuvapisulenuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467273/normal_6039aab4b3a50.pdfIn PDF document text
    • https://venunuwaxel.weebly.com/uploads/1/3/2/7/132740799/woretu.pdfIn PDF document text
    • https://xipurewaxo.weebly.com/uploads/1/3/4/7/134759043/9594126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445343/normal_60417eb315707.pdfIn PDF document text
    • http://bewinizujatuw.iblogger.org/xusekasera.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499021/normal_5fe5feb11b047.pdfIn PDF document text
    • http://wasegulom.mygamesonline.org/algorithms_in_machine_learning.pdfIn PDF document text
    • http://pitoxavoputop.iblogger.org/zexugupedazositezazik.pdfIn PDF document text
    • http://guromufupadaf.iblogger.org/best_annotation_app_for_android_tablet.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/DhbUsgh/wimokufesazitegivomunu.pdfIn PDF document text
    • https://nutuvujupakumap.weebly.com/uploads/1/3/2/7/132740288/b49d8f5598ae0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405660/normal_6002625bbb188.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://xokutamewa.rf.gd/acoustic_phonetics.pdfIn PDF document text
    • http://zegaruso.rf.gd/66069344839.pdfIn PDF document text
    • http://detuzojezil.rf.gd/video_editing_software_for_beginners_free.pdfIn PDF document text
    • http://bipedok.epizy.com/atlin_honing_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://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_off000145a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A8 5052 bytes
SHA-256: e73bd73095c5e78a08faa6aafad380b880f41d6c287ddf8bd5617966e7280fe7
font_01_sfnt_off000156bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156BB 12796 bytes
SHA-256: 3897aefacc0ab2a89ac5c3ac517f8a7c3908c61d9255537af1ea6c2644401575
font_02_sfnt_off00018310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18310 16216 bytes
SHA-256: af44ab475c513300cf2ad4f5de0e39d88e64731ef9cb458a69b05af07fab9fe4
font_03_sfnt_off00019858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19858 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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