Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b94ee35ea527c1…

MALICIOUS

PDF

194.4 KB Created: 2021-03-24 23:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0f257e8a2b0137f8d32e784010118b28 SHA-1: d8749dbb3147a2e1908f732be55c48c8936faa6c SHA-256: 71b94ee35ea527c1a41c99e2aa54b2272ff4ca0b3bffe015dcc6ee0577f322c0
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 0.9987

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://golowaki.ru/123?utm_term=al+kahfi+1-+10+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471091/normal_601c726a85174.pdfIn PDF document text
    • https://cdn.sqhk.co/xugumewaz/hPltEej/guxosarubuzigug.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/aLhaSlI/pengertian_internet_adalah.pdfIn PDF document text
    • http://igclienteam.com/tornado_alley_season_2020742tr.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/dib2icS/26409055708.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/81576612749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_6053911d7f358.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/ejagegh/rainbow_ice_cream_cooking_craze.pdfIn PDF document text
    • https://cdn.sqhk.co/kobamebexog/jPhiidp/atomic_structure_worksheet_7th_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/kikutajaz/hbLtibl/38298594428.pdfIn PDF document text
    • https://cdn.sqhk.co/denepepunuja/jhgeVPX/womolupitiwawu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448719/normal_5ff8fff2b1d4f.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/gfMjj4G/barizagad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_60163ef009a60.pdfIn PDF document text
    • http://fasad-dom.site/how_to_apply_pellon_987f_fusible_fleece4i69g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416664/normal_600239b784b3d.pdfIn PDF document text
    • https://cdn.sqhk.co/gozafavapawu/pjeIjjv/96140028021.pdfIn PDF document text
    • http://ketrovk.xyz/my_name_is_red_quotes_with_page_numberss14gg.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/rezugekolaba/62376903744.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/47505927764.pdfIn PDF document text
    • http://vawirir.atwebpages.com/kupanofunajari.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0002bb11.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2BB11 35184 bytes
SHA-256: 14cc758a9f265b21ff25754e17afccca1568278471e0878664075187186c1690
font_00_sfnt_off00027352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27352 5136 bytes
SHA-256: 4b9bc36cdabce79a6e0b52df110303f00849714940ef4459f501bd170055032f
font_01_sfnt_off0002849e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2849E 6364 bytes
SHA-256: 606f60ca48ab7c1a5cd0e5d2263fc0433568847f455e8d45ab4485900be25029
font_02_sfnt_off00029435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29435 12228 bytes
SHA-256: a92f00063a0891ac253b15b7ae0916648e832fff2f546c3af7baa3800af24803

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