Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f89dca0818b2d9…

MALICIOUS

PDF

70.3 KB Created: 2021-04-05 09:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b4891616897949f4648aae91f428c20 SHA-1: 275ec04919e4bd38da6d00ef72dd18148e2a4f96 SHA-256: 25f89dca0818b2d977e4076f1d4d234cb8bb3d57980a4cfa3cbd87950d75f036
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggests malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to educational worksheets.

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-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://druttle.ru/wix?keyword=imagery+worksheet+4th+grade
    • http://depalowivejal.iblogger.org/remibekedefijuverobewa.pdf
    • https://jedavosezinuli.weebly.com/uploads/1/3/1/4/131438835/poxasukaxivorumoxa.pdf
    • http://safilow.iblogger.org/baermann_technique.pdf
    • http://babubusawase.22web.org/nowelisano.pdf
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/bf7c50889.pdf
    • https://pekiwuvigefarov.weebly.com/uploads/1/3/4/7/134766825/6587038.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nigimul/38915261072.pdf
    • https://s3.amazonaws.com/sigobija/47660548997.pdf
    • http://paxurebuguxowi.rf.gd/90160099638.pdf
    • http://rizoxonepo.rf.gd/vaxopeluxoramamarofibere.pdf
    • https://s3.amazonaws.com/waduzirader/baby_status_malayalam.pdf
    • https://s3.amazonaws.com/zasepo/author_s_point_of_view_worksheets.pdf
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_3466fbe20a5b44188ca41dfa9b6f4162.pdf?index=true
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_ca35f0edd3674d1298823f022520b6e1.pdf?index=true
    • https://s3.amazonaws.com/juduk/9241897166.pdf
    • http://migolow.epizy.com/prolapso_y_procidencia_del_cordon_umbilical.pdf
    • https://s3.amazonaws.com/fatikonavori/76557728451.pdf
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_44fa309706984244befdc3b0f4650265.pdf?index=true
    • https://s3.amazonaws.com/kegubinefuda/begapapinunenowilokef.pdf
    • https://s3.amazonaws.com/votuweroxigezog/83525635872.pdf
    • http://nurirola.rf.gd/sosaxan.pdf
    • http://vewigosowozozi.epizy.com/rekivorabaf.pdf
    • http://rasupaxuxogip.epizy.com/fuzugujoponujewikodexu.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_off0000d54e.bin
5361399dbe23dacd106062844bab3c0fd21b1ae4ca7f47667fbc0e26b8da5dbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD54E 5488 bytes
font_01_sfnt_off0000e7e8.bin
576520e834c8891b6505d0ec60f970877bbbc4ef50e202f0d7edcdb48d4545eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 10568 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.