Malicious PDF — malware analysis report

Static analysis result for SHA-256 d168204831df8b6f…

MALICIOUS

PDF

79.7 KB Created: 2021-02-24 20:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 047c6599f1bc3bc552e640c0f0ecdf8e SHA-1: 12f27152986462ae770dbdb41f9d294bea99cdaa SHA-256: d168204831df8b6f278a07b93cc8e25390d139acb45bca221af3eda3269e8cae
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a likely attempt to deliver a second-stage payload or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://baarspo.ru/wix?keyword=5.1+study+guide+and+intervention+operations+on+functions PDF link annotation
    • http://vazawujuzu.sportsontheweb.net/honda_eu2000i_carburetor_bowl_gasket.pdfIn PDF document text
    • http://help-igcopyright.xyz/61572199240ly2hw.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/nifadikufukuregosotog.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/how_to_say_thank_you_for_comments_on_facebook.pdfIn PDF document text
    • http://regse.website/beer_pong_ball_stuck_between_cups6ls0e.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/the_singer_2017_ep_10_eng_sub.pdfIn PDF document text
    • http://sweetygirl.club/ice_princess_2005_castjh0lk.pdfIn PDF document text
    • http://zarabotok.space/6069770264n4bjm.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/wanifalomazerojovebi.pdfIn PDF document text
    • http://copyright-securityx.com/avira_android_optimizer_pro_apkw4l9t.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/pidufozu/karnataka_bhoomi_map.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/72736359299.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/drawing_book.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/62440045246.pdfIn PDF document text
    • http://vipotunopadilez.rf.gd/60932913522.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/how_to_stretch_for_plantar_fasciitis.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_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 5568 bytes
SHA-256: 8538594f886f266617a4a54801d5381a185cbba20a6a39ee849857f9e089f68d
font_01_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 10504 bytes
SHA-256: bc679764d37e47d4e6ae3ab6934ff4a795c7cd022a11a1e407d4928c648b8f61
font_02_sfnt_off00011af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF8 16704 bytes
SHA-256: d24a3f66483498e39ba54cda0367dba453339776de603fa4ab802545930ff9a2

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