Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc37e95ea45467b…

MALICIOUS

PDF

75.3 KB Created: 2021-06-10 03:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a7d57ca6846dce3eb5e39b7e35294624 SHA-1: b4339407ce643d9d71aaa0efa065c057c8b3d183 SHA-256: fbc37e95ea45467bdf2b745c0b730a52b0d65e2e9c2ef0c120dddf852dafda7d
126 Risk Score

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 0.9999

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://oniceh.ru/pbw?utm_term=name+cake+birthday+photo PDF link annotation
    • https://bokirises.weebly.com/uploads/1/3/1/6/131607331/dixuvigina.pdfIn PDF document text
    • https://pomitowu.weebly.com/uploads/1/3/4/3/134389192/tufevirewu.pdfIn PDF document text
    • https://dapasubasawesol.weebly.com/uploads/1/3/4/3/134383907/vupalojesojovedirog.pdfIn PDF document text
    • https://fofosaja.weebly.com/uploads/1/3/4/2/134234592/vababadoxof.pdfIn PDF document text
    • https://mewofotas.weebly.com/uploads/1/3/4/5/134524455/xulibobajevegup-tijupaxagap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144485106/john_deere_240_skid_steer_manual_free.pdfIn PDF document text
    • http://nudenuxote.pbworks.com/w/file/fetch/144980838/58238282591.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144616068/lavusapare.pdfIn PDF document text
    • http://mujefefimuf.pbworks.com/f/65581572197.pdfIn PDF document text
    • http://nidibewuzi.pbworks.com/w/file/fetch/144550599/how_to_answer_are_you_feeling_better_today.pdfIn PDF document text
    • http://dipoziw.pbworks.com/w/file/fetch/144451503/kurupuke.pdfIn PDF document text
    • http://rimogeto.pbworks.com/w/file/fetch/144427698/uc_browser_for_pc_windows_10_64_bit_free_download_softonic.pdfIn PDF document text
    • http://xodelow.pbworks.com/w/file/fetch/144641142/what_is_a_good_daily_yoga_routine.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/f/28727981969.pdfIn PDF document text
    • http://xemademeku.pbworks.com/w/file/fetch/144718707/jnc_9_guidelines_for_hypertension.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/f/47520945405.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/bertelsmann_foundation_transformation_index_2018.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/w/file/fetch/144822417/learning_license_test_questions_download.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_off0000e6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AA 5380 bytes
SHA-256: e5affba737ff6e4fb7587b40da0a7ce156bb69bbc2f74f258543bc5db72eadb8
font_01_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 11204 bytes
SHA-256: 2d520b00bd63bde1b6e05d69feb22af0015bb9e7eb26f7b30345202f0c1a8b6a