Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f7b5279852160a…

MALICIOUS

PDF

95.0 KB Created: 2021-03-21 06:52:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4288120aab03a791576522d3c1182eae SHA-1: d0763a54005e354d3ec0eb19ac358e4af8d319b0 SHA-256: e7f7b5279852160a34f6a72716a48040f6d148b1696e37b2fd19404557c55976
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized with academic-sounding keywords, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the embedded URLs. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=kolmogorov+fomin+functional+analysis+pdf
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/jefitifu-fegen.pdf
    • http://zujadise.scienceontheweb.net/55572907931.pdf
    • http://fekevopimibun.sportsontheweb.net/charlie_and_the_chocolate_factory_music_original.pdf
    • https://vedixoba.weebly.com/uploads/1/3/4/8/134864822/a1c7f17fd1f2.pdf
    • http://poposiruta.mywebcommunity.org/sketchup_2016_free_download_for_windows_7_32_bit.pdf
    • https://xevujudibibabus.weebly.com/uploads/1/3/4/5/134599482/2589331.pdf
    • https://zonerizarom.weebly.com/uploads/1/3/4/3/134310007/lilupatatezufas.pdf
    • https://nogenovone.weebly.com/uploads/1/3/4/7/134745979/0c14245e776c00e.pdf
    • https://zovuzutozureje.weebly.com/uploads/1/3/0/7/130739602/wizif-bipapemosovaj.pdf
    • https://masiwirisiniziz.weebly.com/uploads/1/3/1/4/131453333/kujepowozusagezetoju.pdf
    • https://gurazelifu.weebly.com/uploads/1/3/0/8/130874247/5755724.pdf
    • https://puliwive.weebly.com/uploads/1/3/4/6/134660228/dabd57c15c89.pdf
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/koluram_matojitufokurub_gemitilebiba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fezenur/66469571702.pdf
    • https://s3.amazonaws.com/nojemi/duwamish_river_fishing_reports.pdf
    • https://s3.amazonaws.com/kigavanus/genopogebanepolaxanu.pdf
    • http://jifisuxevizek.myartsonline.com/campbell_biology_9th_edition_test_bank.pdf
    • http://mepitar.atwebpages.com/25555911248.pdf
    • https://s3.amazonaws.com/defipedibe/easton_hexx_arrow_spine_chart.pdf
    • https://s3.amazonaws.com/pafexegud/nobudigidimebetomoxaj.pdf
    • http://bifiwapaz.onlinewebshop.net/que_tipo_de_sistemas_de_informacin_identifica_en_la_empresa.pdf
    • https://s3.amazonaws.com/pexodugosa/school_days_mod_apk_android_1.pdf
    • http://refusunono.onlinewebshop.net/the_book_of_symbols_taschen_review.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
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a0.bin
f016c5f880a2f64ef0dc2dff6434bf12e9cbcc45038e6803939750f4a0ddb318		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 3492 bytes
font_01_sfnt_off00010603.bin
08dd34c66cb1474ca2f2920177667fe762f7ac07bdc51e1630bda22bc5d85a70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 5608 bytes
font_02_sfnt_off000118e5.bin
707b9eb8074dc54a9393a448815126b1beba9cd8b6d81436df54c5a8ac447d22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 6364 bytes
font_03_sfnt_off00012879.bin
bdfd494478e74d257afe7b49bb70a85d18b6364077525ba80d7730d96dc93242		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12879 13988 bytes
font_04_sfnt_off00015712.bin
cd2b8bd12c9e710dba4aae584ca7dba13f69546e491bf05e92ae514a0a0aa772		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15712 16416 bytes

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