Malicious PDF — malware analysis report

Static analysis result for SHA-256 016045b053a80400…

MALICIOUS

PDF

82.5 KB Created: 2021-03-20 20:13:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 578bd37727e8b710dc756ccaefe6c5df SHA-1: 145eb5f18be601feea050aa72dc6fe8f57c44dbf SHA-256: 016045b053a8040004a12224a33e8ed0e56f0a42a62d16a913eda0a3f13adece
134 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm on disposable hosting. The PDF contains numerous external URIs pointing to potentially malicious domains, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

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://druttle.ru/award?keyword=pdf+encyclopedia+of+general+knowledge PDF link annotation
    • https://cdn.sqhk.co/linidivez/ojhg2DN/nhl_hockey_news_tsn.pdfIn PDF document text
    • http://playmarket-online.com/mopojuzunubuzerafezires4oa8g.pdfIn PDF document text
    • http://prizinsta.online/baby_names_2020_social_security6g4b2.pdfIn PDF document text
    • http://helpcenter.business/infection_control_certification_study_guidessb60.pdfIn PDF document text
    • http://springwin.space/peq_15_specsvlsfo.pdfIn PDF document text
    • http://new-leggins.site/how_to_export_keynote_into_powerpoint0pz2x.pdfIn PDF document text
    • http://1xbet-registrat.site/air_new_zealand_app_for_androidmlpmq.pdfIn PDF document text
    • http://tadunikij.22web.org/link_s_awakening_remake_strategy_guide.pdfIn PDF document text
    • http://losasawavezu.iblogger.org/91474631977.pdfIn PDF document text
    • http://9gusevshop.space/dicionario_auleted8zcw.pdfIn PDF document text
    • http://hiziryigit.online/graphic_design_the_new_basics_ellen_luptonlcp0t.pdfIn PDF document text
    • http://teren.fun/99065136899ulcxe.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/gieqgcU/wapolidodebibemixeduroz.pdfIn PDF document text
    • http://trynon.xyz/2001_polaris_scrambler_400_specstr003.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/luxaduzimase/arnold_maya_2018.pdfIn PDF document text
    • http://wowadepadon.rf.gd/blackmagic_pocket_cinema_camera_6k_footage.pdfIn PDF document text
    • http://xukiwelufa.epizy.com/35507559349.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/bartok_mikrokosmos_book_1.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/rug_doctor_pro_instructions_for_use.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_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 5404 bytes
SHA-256: 172691b050e92effcae70e12e3d4ef7c80ff7711ec0f4c0c9f1118671d9af079
font_01_sfnt_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 11688 bytes
SHA-256: 53a465a27673da56a42a679d6a26ca8f76c3272082342217c8e6d635099f58d1
font_02_sfnt_off000125c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C7 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c

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