Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a9e72c61f709fa…

MALICIOUS

PDF

80.0 KB Created: 2021-02-11 10:55:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1afd869fde1943848b63bcb56c351feb SHA-1: 866e1e8acc7e00e4cd8cf6314bbc915e235d41e7 SHA-256: c8a9e72c61f709fa5d910162914f071841a91b05598b4702ba1b314775272637
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, and one URL is explicitly identified as a potential download lure. The presence of external URIs and a 'download button' heuristic suggests an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/123?utm_term=bt+notification+app+for+iphone PDF link annotation
    • https://cdn.sqhk.co/zosiwikiw/etM0fFG/89358460222.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzujugasije/iEhbjjz/red_cross_coloring_pages.pdfIn PDF document text
    • http://5coupon.info/new_pokemon_android_game_freeotdit.pdfIn PDF document text
    • https://molefagis.weebly.com/uploads/1/3/5/3/135311004/b98261568799.pdfIn PDF document text
    • http://creamwalls.space/white_queen_platform_bed_ikeafblk1.pdfIn PDF document text
    • http://biomaniix.website/91158100775uq3o5.pdfIn PDF document text
    • http://espaceclient-cmb.com/baskerville_old_face_italic_freez1nnk.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/sasusiruv.pdfIn PDF document text
    • http://tehnotop.site/sadafekuvajoflrw8t.pdfIn PDF document text
    • https://biputivaninude.weebly.com/uploads/1/3/1/4/131438500/kusafa.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/LYjhmhg/trucos_de_fifa_soccer_13_ps3.pdfIn PDF document text
    • http://keto-s1.com/wedikefuwujipofobajukaveel.pdfIn PDF document text
    • http://tryne.xyz/gestational_diabetes_management_guidelinesj8jht.pdfIn PDF document text
    • https://kisetizep.weebly.com/uploads/1/3/5/9/135992433/panotokokije.pdfIn PDF document text
    • https://gupuvuzuguzi.weebly.com/uploads/1/3/1/3/131379578/xakevefu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujukiji.rf.gd/bitten_imdb_parents_guide.pdfIn PDF document text
    • http://suvuxugoboboju.rf.gd/technical_project_manager_interview_questions_and_answers.pdfIn PDF document text
    • http://jezuwujitek.epizy.com/corporate_accounting_calicut_university_2017_admission.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_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 4944 bytes
SHA-256: e92a0e5f2e3755ff3bafc171bbf748c33911db0c2bdbc747e9002a981b723238
font_01_sfnt_off00010d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D65 10960 bytes
SHA-256: 7360efdf345484c5a138af0d69cf59ba9fab0aa9fd9f083d3fb2c6192cfbd9b2

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