Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bbe4d32a4249b0…

MALICIOUS

PDF

75.1 KB Created: 2021-03-30 03:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4445b918c0acc3cf4ac45074ea00cdaf SHA-1: b7b0baa5b7c869be9e080fa2c5d68a0667a90ddd SHA-256: 93bbe4d32a4249b0bfa4f9c46c23446d68c0d663f48d773af7a38fa3b46625a1
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a mass external PDF link farm, with numerous URLs pointing to external PDFs. One of the embedded URLs is https://maypoin.ru/wix?keyword=frame+within+a+frame, suggesting a phishing or redirection attempt. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a malicious document designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/wix?keyword=frame+within+a+frame
    • https://cdn.sqhk.co/tajixixejafi/gehbQhl/kotavorinuzulomurozobas.pdf
    • https://cdn-cms.f-static.net/uploads/4419225/normal_605badb818433.pdf
    • https://cdn-cms.f-static.net/uploads/4490116/normal_6023f1046c387.pdf
    • https://cdn-cms.f-static.net/uploads/4403938/normal_5fe699b23b369.pdf
    • https://cdn-cms.f-static.net/uploads/4414494/normal_602f1abb9df1e.pdf
    • https://cdn.sqhk.co/salozudat/ic94aie/xakidalunimufotavan.pdf
    • https://cdn-cms.f-static.net/uploads/4369671/normal_603291103fe2d.pdf
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/xukowalevapixu-rosididi.pdf
    • https://cdn.sqhk.co/wifenepomojo/Qhf6giS/superhero_run_2019_malaysia.pdf
    • https://mosugomepa.weebly.com/uploads/1/3/4/0/134096926/virofi.pdf
    • https://cdn-cms.f-static.net/uploads/4368989/normal_6041a4748ceb4.pdf
    • https://static.s123-cdn-static.com/uploads/4487918/normal_5ffac125c4f52.pdf
    • http://dejivuxa.mygamesonline.org/englander_pellet_stove_manual_55-shp10.pdf
    • https://cdn-cms.f-static.net/uploads/4407782/normal_6035e58f1029a.pdf
    • https://pakujefaf.weebly.com/uploads/1/3/0/7/130740244/xudeje-zenafo-wetetevuvujuji.pdf
    • https://cdn.sqhk.co/zejegure/iauahjf/retotodo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lopeteb/87082294496.pdf
    • https://s3.amazonaws.com/bidivo/55375912921.pdf
    • https://s3.amazonaws.com/xakajoziwibi/the_walking_dead_comics_for_sale.pdf
    • http://gixiluvigatekij.atwebpages.com/calculus_books_free_download.pdf
    • https://s3.amazonaws.com/rolefosiju/make_me_believe_you_song.pdf
    • https://s3.amazonaws.com/budovewesekaz/clumsy_ninja_hacked_apk_android.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_off0000e9de.bin
f517158e2a6536dcf9ad694840bdc75611f75b6c6feaaee53cd13fd1b14c139c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 4844 bytes
font_01_sfnt_off0000fa40.bin
0df9c170182e453f8308adb11bffaa3cdf24421be0aa1e4154774c9e29afa188		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA40 10880 bytes

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