Malicious PDF — malware analysis report

Static analysis result for SHA-256 09425357fd506786…

MALICIOUS

PDF

70.9 KB Created: 2021-02-19 07:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9b1c0bdc7df04e887df185a466f337e4 SHA-1: 9bc08ec330a2a22c7c775d0ed2f7a30146b0aaf3 SHA-256: 09425357fd506786d1f86e819258b45ffac3ea2dc1b742963d0ecf01a5ac4690
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, some pointing to disposable hosting, and a heuristic indicating a 'download button' lure. The document body is heavily obfuscated, but the presence of external links and the 'download button' heuristic suggest a phishing or social engineering attack aimed at tricking the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=angularjs+free+book PDF link annotation
    • http://all-system7.work/critical_thinking_questions_and_answerseof0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378836/normal_5ff1ce8814bdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_6016ace56370d.pdfIn PDF document text
    • http://chebsvet.ru/les_panafricanistesroxdc.pdfIn PDF document text
    • https://cdn.sqhk.co/ripigopes/jjififb/91319214606.pdfIn PDF document text
    • https://cdn.sqhk.co/tivomepu/xtZjCje/speed_moto_bike_racing_pro_game_3d_apk.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/lp_hernia_umbilikalisjd2o6.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/BhjhdKN/wink_dating_app_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414353/normal_5fcc3ae919596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379380/normal_602d7f8695045.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/iagghf1/goralixavunolimofepagaxu.pdfIn PDF document text
    • http://storeplus.pro/3981240619540o1t.pdfIn PDF document text
    • http://vknart.xyz/armed_forces_compensation_scheme_claim_formd8re8.pdfIn PDF document text
    • http://werenntaq.online/ocr_gcse_maths_past_papers_answersqv6dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_5fd342857ec96.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/gezUNgf/79116776498.pdfIn PDF document text
    • http://fartook.online/adolescent_reproductive_health_services9adkn.pdfIn PDF document text
    • http://copriyghtconfirmed.com/framelayout_in_android_tutorialara7v.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/nerugiraxura/junosovagenixadexevewe.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/jasperreports_pom_dependency.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_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 5204 bytes
SHA-256: 73a2dc076ca7ef069272ed4e667a1b15aea72d5e1eb1965a06691f7c34fc56f3
font_01_sfnt_off0000e8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 11156 bytes
SHA-256: 1c4de1b64093ab0a7d74b776ca835e4d3b790a17f9ddc2fff154fadd425b354e

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