Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a450c6c383b2e27…

MALICIOUS

PDF

73.1 KB Created: 2021-03-30 04:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a6b62bef80384cb8b542ffc1a94e203 SHA-1: 0d162e196a883f3968c49a1ce6651c8535b830c9 SHA-256: 9a450c6c383b2e2789f7b44412c528c5b84e629bdd83583472bd2c8b4b05526e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-optimized and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'https://dafemum.ru/award?keyword=financial+accounting+1+mcqs+with+answers+pdf', suggests a lure to disguise the malicious intent. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/award?keyword=financial+accounting+1+mcqs+with+answers+pdf
    • http://igafnd.org/perfect_violin_sheet_music_musescore2lkty.pdf
    • http://copyright-notice-ig.com/fobetegelomumowadegutsayt3.pdf
    • http://shoplus.info/vizavenok6k8z0.pdf
    • http://henrysavbr.site/recipes_for_rockcrok_everyday_panrzdy5.pdf
    • https://kanodofeju.weebly.com/uploads/1/3/5/3/135325650/mogowalij-gonaf-nexutagafexunam.pdf
    • http://harmony-market.ru/347228299839t8fr.pdf
    • https://suterigegopos.weebly.com/uploads/1/3/2/6/132695321/vidus.pdf
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/0c1350f79501.pdf
    • https://dotolisode.weebly.com/uploads/1/3/4/6/134616401/5e8b07c291c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kugelilizibuwum/bangla_dictionary_java_jar.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/rakunamemerovibun.pdf
    • https://s3.amazonaws.com/nuselufuzo/41495774883.pdf
    • https://uploads.strikinglycdn.com/files/9daf79b4-2517-4a22-812a-925d1af7b9f6/el_pollo_loco_500_calorie_menu.pdf
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_2c76e1c85dca4284997bb1c1a8b70ac3.pdf?index=true
    • https://s3.amazonaws.com/tokatefozude/mevijepesuwuzexozibuvixa.pdf
    • https://s3.amazonaws.com/kozewuposoridil/lenovo_t430_weight_kg.pdf
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_8e27d24e65a94e71baefad42bce01be2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aa866167-7e71-4d11-ac43-787e8c88996a/wuwubafefarevudetav.pdf
    • https://uploads.strikinglycdn.com/files/cc6bc08d-3945-4132-85dd-21724226ce58/82620022059.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_off0000de3a.bin
f31118b4ced03b8c3c504e29b286fecf9b6da93907a8bc729dcba87e4012d3a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 5796 bytes
font_01_sfnt_off0000f1d1.bin
4e20a5a5d18543ac85281c2c7aad7612ea8fb4fd8df35d57fe1302914e93fff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 10864 bytes

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