Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b33d76300c703b…

MALICIOUS

PDF

86.9 KB Created: 2021-02-13 22:52:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e8ee2bc81491cb1790e55a3043db4e88 SHA-1: 7eeca13593b1d4c257d85c74e9f7835f9c7b623f SHA-256: a1b33d76300c703bbb348ff2c5a41dd015f9adb16cc8c7224e97828b4af25e94
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or SEO spam campaign. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to manipulate search engine results or distribute further malicious content. The embedded URLs and the nature of the link farm point towards a phishing or content-scraping attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/wb?keyword=fmea%20manual%204th%20edition%20pdf PDF link annotation
    • https://kobizixudowizeb.weebly.com/uploads/1/3/4/4/134402546/3843769.pdfIn PDF document text
    • https://xukusoresi.weebly.com/uploads/1/3/4/4/134488105/507c2b7.pdfIn PDF document text
    • http://gidomepijamasos.iblogger.org/35820924179.pdfIn PDF document text
    • https://kuxadituva.weebly.com/uploads/1/3/1/3/131380841/1228295.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/1266846.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/vibuzasukifege.pdfIn PDF document text
    • https://kidubaviputotej.weebly.com/uploads/1/3/4/5/134520398/lijomokip.pdfIn PDF document text
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/8fe2b.pdfIn PDF document text
    • https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/9175603.pdfIn PDF document text
    • http://gejopuzebizovuk.iblogger.org/alister_mcgrath_historical_theology.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/ifhdMbQ/tojejodekiri.pdfIn PDF document text
    • https://cdn.sqhk.co/fafaviwi/kwjgia3/bendy_coloring_pic.pdfIn PDF document text
    • https://fefokepixax.weebly.com/uploads/1/3/1/4/131452923/pidopojag_sazedifaxugux_kitadabodeful_linufozajol.pdfIn PDF document text
    • https://biwewonopegad.weebly.com/uploads/1/3/1/3/131380063/vafipejojinimol-dipotepuzevo-duwupexupumudi.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/jcgiGTD/army_gunship_helicopter_games_simulator_battle_warrior.pdfIn PDF document text
    • https://diniporugixufov.weebly.com/uploads/1/3/1/8/131856235/f16309d18c.pdfIn PDF document text
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/8296034.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/fejenijovekozu/social_phobia_and_anxiety_inventory_spai.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/52111824552.pdfIn PDF document text
    • http://wuxirakagatijir.epizy.com/romantic_couple_cartoon_hd_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/receipt_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/44259224907.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_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 5052 bytes
SHA-256: fd3a638d1c59597f5527167b4ec487ce1dfe2001b20249a3c43b2623c325eca9
font_01_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 12116 bytes
SHA-256: b54ae0b877e4f7cb03779d2e722ccf13aa056748b0a65b131ed546433d921dec
font_02_sfnt_off000138e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E1 16212 bytes
SHA-256: 5aae174977978ee355388245b275775588f2b89b765a4c629ad8073a608c4317