Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c02f162d34b3c2…

MALICIOUS

PDF

76.5 KB Created: 2021-03-13 22:25:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eea110fa46b785f21282e0f57919c706 SHA-1: b109ab8488875bc88a0c9c0ad3e92e5ef92b1200 SHA-256: 99c02f162d34b3c29ad7433870f949e295ed543c42b66b73c0f02554e4efba04
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to suspicious domains and are likely part of a link farm designed to host malicious content or phishing pages. The primary URL, 'https://mezovuduw.ru/wix?keyword=cmp3+grade+7+what+do+you+expect+answer+key', is presented as an answer key, a common lure for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/wix?keyword=cmp3+grade+7+what+do+you+expect+answer+key
    • https://lojopozubog.weebly.com/uploads/1/3/1/6/131606756/df7f5.pdf
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/956551.pdf
    • https://mosutija.weebly.com/uploads/1/3/4/5/134502389/0ae53c.pdf
    • http://zujugowez.iblogger.org/988505910.pdf
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5fd0a8334fa1e.pdf
    • https://widegavadiwudux.weebly.com/uploads/1/3/5/3/135325068/e0ba0e8f9189.pdf
    • http://prolac.ru/90728246995og31f.pdf
    • https://static.s123-cdn-static.com/uploads/4463005/normal_6001e85165916.pdf
    • https://vanizubifimid.weebly.com/uploads/1/3/0/8/130874516/gewadipedobuz.pdf
    • http://henrysavbr.site/should_or_ought_to_exercisesslol6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2a67ca32-0d39-4235-9c8c-15a5cefe06bf/36565208674.pdf
    • https://uploads.strikinglycdn.com/files/b538aa34-1827-40a8-bc32-3a54589e85f2/how_to_create_simple_excel_formulas.pdf
    • https://uploads.strikinglycdn.com/files/130e6e31-57cd-4b58-8b5b-2d362ea634e0/barofi.pdf
    • https://uploads.strikinglycdn.com/files/9886a1b2-1a5d-4e19-9ca4-cfe102502926/93546954691.pdf
    • http://golokelu.rf.gd/w_fragen_mit_prpositionen_bungen.pdf
    • http://kivudul.rf.gd/diary_of_a_wimpy_kid_long_haul_full_movie_dailymotion.pdf
    • https://uploads.strikinglycdn.com/files/eb572484-2d32-4644-8ff8-ee1b543cc5ae/jacobsen_parts_lookup.pdf
    • https://uploads.strikinglycdn.com/files/861141b3-d489-4d0b-bf3f-eb1348882c7e/jurudelelokubokolabujemev.pdf
    • http://zijuboniwopaxi.epizy.com/the_book_thief_plot_events.pdf
    • https://uploads.strikinglycdn.com/files/67e2a534-3d40-4ddb-a47a-1de04131a33d/why_does_my_gas_oven_not_get_hot_enough.pdf
    • http://mamuzov.rf.gd/13401049793.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_off0000ebe9.bin
8c4d74baff87b2bfbbfa9eba5271f4f25fd1e61ab652c2520dc58e121156423b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 5932 bytes
font_01_sfnt_off0001000d.bin
95749bf402771bab61d8fe95564f7f178359b0a788f3ae4241af661974f12d63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1000D 10872 bytes

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