Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f23d87ef954a5e…

MALICIOUS

PDF

80.7 KB Created: 2021-02-22 23:07:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 4ce43f18c82da8ae09b7b1402eb0588f SHA-1: 4b81248ff1302f4c244cb5097e652dfd230d0fa1 SHA-256: 90f23d87ef954a5e1650a519e379d330210bf161419d8cc817c056bb43a7aedb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to direct users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate malicious content, with the PDF being flagged as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/wix?keyword=is+storyblocks+worth+it PDF link annotation
    • https://cdn.sqhk.co/mareduviger/an0ifje/custom_sports_apparel_stores_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/dsgfqic/health_insurance_marketplace_texas_rates.pdfIn PDF document text
    • https://zunarorukozem.weebly.com/uploads/1/3/4/0/134016655/da3ff324a4f60.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/igjgoje/durulumajuwetiruro.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/MhfJhe2/kimevido.pdfIn PDF document text
    • https://nefarixutasirov.weebly.com/uploads/1/3/1/6/131606035/ruxugozesu-wonomosogexa.pdfIn PDF document text
    • https://cdn.sqhk.co/koroxofusino/2wXHzgh/mopigelexijeje.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/wgjiaig/nulirava.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/hjdhfjb/iihf_world_juniors_2020_canada_roster.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/jjhfhiz/monster_doll_dress_up_magical_monster_doll_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/hbVggDl/n64_emulator_apk_uptodown.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vebodowumiba.epizy.com/what_is_proctored_exam_mean.pdfIn PDF document text
    • http://xefavab.rf.gd/wavemuvep.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 5012 bytes
SHA-256: 0b2c56df0897163dec3849b65a34f10e8f972cfe2bbbea5e76eda2b0288b81af
font_01_sfnt_off00010842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 10704 bytes
SHA-256: 52dc2aa207f3758a1a29c5f747be509101ec222a3b7532bdb543d0a75f7f1810

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