Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fe13f84e1dc5b5…

MALICIOUS

PDF

82.1 KB Created: 2021-03-29 03:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bf1db8825cc3ad8ca7c0e5f61470076 SHA-1: d81c8a2b67655e91bb0dc291c44a65062db3474d SHA-256: c8fe13f84e1dc5b5f8669e5c739a37d13ff573063ea2df965a3593a0112584e5
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on external services. The primary URL, https://vilenefex.ru/wix?keyword=the+office+songs+cafe+disco, suggests a lure related to search engine optimization or content aggregation. While no scripts were explicitly extracted, the nature of the link farm and the ML_NYX_PDF_MALICIOUS heuristic indicate a malicious intent, likely to drive traffic or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/wix?keyword=the+office+songs+cafe+disco
    • https://cdn.sqhk.co/jotenitix/jiD9Mqs/full_screen_tamil_video_status_app_download.pdf
    • https://cdn.sqhk.co/wuvupalib/heqhaia/knights_of_columbus_hall_near_me.pdf
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/nomukexurikinovisuz.pdf
    • https://cdn.sqhk.co/norekabalak/giGjbP5/rs3_dagannoth_slayer_guide.pdf
    • https://cdn.sqhk.co/xaloxezajaga/hjiheib/32854633176.pdf
    • https://kezugefoluvero.weebly.com/uploads/1/3/1/8/131856244/feweval.pdf
    • https://jukejifoka.weebly.com/uploads/1/3/5/3/135311866/409482.pdf
    • https://cdn.sqhk.co/vadavenaw/cWSOcLC/6147622221.pdf
    • http://koreanluxe.com/simasizaxadisegajoruka3bkgg.pdf
    • https://satepiwe.weebly.com/uploads/1/3/5/3/135350267/xokofukowod-refusizewepo-gawuvovelijoveg-xodebiza.pdf
    • http://pc-remont.website/nomidemebaxivunulejosinup5946r.pdf
    • https://cdn.sqhk.co/dodiniwotud/e2gdPgg/11294255493.pdf
    • https://mesajenijapab.weebly.com/uploads/1/3/0/9/130969967/2873989.pdf
    • http://new-volosi.ru/57729111446rt00a.pdf
    • http://scoretdho.best/62549421954olqi6.pdf
    • https://cdn.sqhk.co/zirevazul/Mjduhev/80690717061.pdf
    • https://cdn.sqhk.co/samofetob/iipibii/letovagixozomovip.pdf
    • http://nashremont.site/the_raven_remastered_review_ign5ydob.pdf
    • https://cdn.sqhk.co/barugogip/je9hfTp/donkey_kong_arcade_game_music.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jivagajamav/54843975976.pdf
    • https://s3.amazonaws.com/gebukil/18199823092.pdf
    • https://s3.amazonaws.com/xanunafojuloki/99931756251.pdf
    • https://s3.amazonaws.com/dudurat/mcent_browser_mod_apk_2017.pdf
    • https://s3.amazonaws.com/julaxel/twisted_treeline_ranked_guide.pdf
    • https://s3.amazonaws.com/teximikamukubo/2018_calendar_template_word_monday_start.pdf
    • https://s3.amazonaws.com/nijudow/48714869255.pdf
    • https://s3.amazonaws.com/kifutizijebuj/psalms_bible_study_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103b8.bin
4b0f9b5a230bba865142152db070e0ee4ba6df69b004ca167cbaa88020ac71fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 5104 bytes
font_01_sfnt_off0001151b.bin
9dfa89b2fbf0d088af6e2365e0c8de8ba9c9e0f69a5449668a502dbb629ffefc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 11244 bytes

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