Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a25597ad339fa75…

MALICIOUS

PDF

83.0 KB Created: 2021-03-23 05:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 855739f5b57ca6156ad69a7966dae309 SHA-1: 7ed110457c128c78ead781700e8300efa74825b5 SHA-256: 2a25597ad339fa755daf7af937b99054e3bd76e21ed1738bba88ac1bff700b9f
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-focused, suggesting a link farm or spamming operation. One of the primary URLs, 'https://leonvi.ru/wix?keyword=6+channel+dvr', appears to be a lure for users searching for specific technical equipment. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=6+channel+dvr
    • http://gijipodotetojo.22web.org/39990263936.pdf
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/xesupedelumab_lamomabate_difopiga.pdf
    • https://gotedimonov.weebly.com/uploads/1/3/4/7/134761190/270951.pdf
    • https://bufetokarad.weebly.com/uploads/1/3/4/0/134096279/8362232.pdf
    • http://flymoney.net/lg_exalt_2695t4.pdf
    • https://fagesuxolibedif.weebly.com/uploads/1/3/0/9/130969327/sadidalipokegefaji.pdf
    • http://profibrend.ru/descartes_meditation_1-6wr2mp.pdf
    • https://sadutixonigonu.weebly.com/uploads/1/3/1/4/131412491/8e6bb.pdf
    • https://xekariwunaju.weebly.com/uploads/1/3/1/0/131070431/rukusafun-wefinufapatun.pdf
    • http://5coupons.info/dunereberesirofukirojafuxo61rd.pdf
    • https://bopegaxuz.weebly.com/uploads/1/3/1/4/131406849/c5d79a.pdf
    • https://ragenakesigufu.weebly.com/uploads/1/3/2/7/132740294/2c4e438df8055.pdf
    • http://itmax.info/what_is_progressive_scan_dvdvysjw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/megelugik/aiag_fmea_handbook.pdf
    • https://s3.amazonaws.com/dorobukasawituw/59467316395.pdf
    • http://wogurep.epizy.com/41098397790.pdf
    • http://dazewedoxagaxaz.epizy.com/writing_punctuation_rules.pdf
    • https://s3.amazonaws.com/jeromisixinolib/xenabex.pdf
    • https://s3.amazonaws.com/satulibaren/38540530952.pdf
    • http://romigutik.epizy.com/73715552563.pdf
    • https://s3.amazonaws.com/pavujiniz/amazing_bikes_wallpapers.pdf
    • https://s3.amazonaws.com/limewub/avast_internet_security_full_version.pdf
    • https://s3.amazonaws.com/dubiditiginowo/making_a_spreadsheet_for_expenses.pdf
    • https://s3.amazonaws.com/lovetijif/boxozobiwezomomi.pdf
    • http://xizajitidug.rf.gd/12392743954.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_off00010917.bin
39e2036580e33bf9b04d75225c66537b4770e07324cb94ca1e73b77906f034a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 4968 bytes
font_01_sfnt_off000119f6.bin
0734049a7c5596da4b6ddb294bc078dc712f0bac0fd60298f6bb568a609e95f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 10880 bytes

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