Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6809ba0c896693…

MALICIOUS

PDF

89.0 KB Created: 2021-03-15 12:05:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a15f942cc893ddb22eaf75f8756366dd SHA-1: d34ff49d9cbf8b8613257a521f149ed291e0469c SHA-256: 0a6809ba0c8966932c9971e86572fe77b9758b43b43c0de603c1794fabcc4a8d
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'zajinet.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'hands only cpr worksheet answers'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 4

  • 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://zajinet.ru/wix?keyword=hands+only+cpr+worksheet+answers
    • https://static.s123-cdn-static.com/uploads/4452587/normal_5fcb37d8cc379.pdf
    • https://static.s123-cdn-static.com/uploads/4484356/normal_5ffad10b30611.pdf
    • http://mozodulo.iblogger.org/freeing_evil_dave_quick_guide_osrs.pdf
    • https://static.s123-cdn-static.com/uploads/4426415/normal_5ffdb890f0330.pdf
    • http://sanejuvarasukip.iblogger.org/syllabication_worksheets_with_answer_key.pdf
    • http://dupesagefad.22web.org/rasedabewutuponanenik.pdf
    • https://genexezo.weebly.com/uploads/1/3/4/6/134616565/puxitefonegad.pdf
    • http://litifafoj.iblogger.org/16613889022.pdf
    • http://usersonlineguardingsettings.site/stick_hero_fight_hackeadoxl5ff.pdf
    • http://interior.estate/35416696009w4gmt.pdf
    • https://cdn-cms.f-static.net/uploads/4369166/normal_600be7bf5aacf.pdf
    • https://bovakexigi.weebly.com/uploads/1/3/5/3/135314068/62bb0a81.pdf
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/484e1903aba398.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mijunuwe.epizy.com/3110022885.pdf
    • https://s3.amazonaws.com/bojafazes/pugofigefutisunak.pdf
    • http://budunasetixap.epizy.com/81302255901.pdf
    • http://dinixikidimed.epizy.com/annual_credit_report_request_service_atlanta_ga.pdf
    • http://wavujupozin.epizy.com/analogy_examples_in_literature.pdf
    • http://foretoxute.epizy.com/fusuzobopewumifur.pdf
    • https://s3.amazonaws.com/vavabi/fojij.pdf
    • http://lipaxubizilek.epizy.com/just_the_way_of_the_world_lyrics.pdf
    • https://s3.amazonaws.com/lebejos/vamonafiripigigajowup.pdf
    • https://s3.amazonaws.com/wusigipufuvowix/topopoxosusumemexeg.pdf
    • https://s3.amazonaws.com/jopomodilamego/33749054009.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a8e.bin
034c2d378ab5a5b5edccfed570134f377f49b1cc9713d9fa1341e80265e8d2f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 5380 bytes
font_01_sfnt_off00011cec.bin
2533a3d80ba4def76caa2d198fef0a3d97d4e57387036add724c41540bf290eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEC 10524 bytes
font_02_sfnt_off00014119.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14119 16204 bytes

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