Malicious PDF — malware analysis report

Static analysis result for SHA-256 e889cdeb5a288051…

MALICIOUS

PDF

79.9 KB Created: 2021-03-22 00:05:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50d672a69a64eb8c993f8931a217dd12 SHA-1: d869ad89958e66cf75718e9a472a96fe3bffcc1b SHA-256: e889cdeb5a28805111993349c335cbe33192975c0b51a1773237adb60599386f
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 'nipisod.ru', which is likely a malicious domain used for phishing or to host further malicious content. The document body, though heavily obfuscated, suggests a lure related to 'argumentative writing worksheets'. No scripts were extracted, but the presence of an external URI in a malicious PDF strongly suggests an attempt to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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://nipisod.ru/award?keyword=argumentative+writing+worksheets+pdf
    • https://cdn-cms.f-static.net/uploads/4497081/normal_605162179cac4.pdf
    • https://cdn-cms.f-static.net/uploads/4409107/normal_6016cd0835c93.pdf
    • https://cdn.sqhk.co/vorebilifi/bR2icja/xozawirazilo.pdf
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/losirigowen_bupidajowe_dubonugupav.pdf
    • https://cdn.sqhk.co/simikitivo/gjgO1hj/stick_cricket_premier_league_uptodown.pdf
    • https://gojanaribebiw.weebly.com/uploads/1/3/1/4/131437307/ludima.pdf
    • https://cdn-cms.f-static.net/uploads/4469643/normal_602245ee40042.pdf
    • https://static.s123-cdn-static.com/uploads/4418383/normal_600370cb1538a.pdf
    • https://jakuxibakamu.weebly.com/uploads/1/3/1/4/131407414/taxetoxo-dipugowegaxibi-wuxubo-dajodon.pdf
    • https://cdn.sqhk.co/bujasugawo/0jgQUG1/sudiweluzinejexodor.pdf
    • http://fepemewavitik.66ghz.com/calendario_2020_gratis_da_stampare.pdf
    • https://cdn-cms.f-static.net/uploads/4445541/normal_6038fc0d57033.pdf
    • https://zexirajeroluwub.weebly.com/uploads/1/3/4/8/134848753/9215952.pdf
    • https://nimadelafux.weebly.com/uploads/1/3/2/6/132695392/79901f10ee.pdf
    • https://cdn.sqhk.co/belesobikezi/HhcsijW/pikejoxezarolo.pdf
    • https://cdn.sqhk.co/xewebevij/Uijhdha/judimupisiwelifilodoxe.pdf
    • http://ledukamu.iblogger.org/how_to_do_a_mini_mental_state_examination.pdf
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/1b17d8da339021.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kovozenamofox/caves_roguelike_hack_apk.pdf
    • http://boxitevu.rf.gd/airline_commander_unlimited_money.pdf
    • https://s3.amazonaws.com/vawoginele/vsco_apk_full_unlocked_2018_ios.pdf
    • https://s3.amazonaws.com/jiwotarotavuz/craft_cms_contact_form_fields.pdf
    • https://s3.amazonaws.com/bezutu/femuxelixikarol.pdf
    • http://wegefidipa.epizy.com/reading_comprehension_strategies_worksheets.pdf
    • https://s3.amazonaws.com/bodajaku/i_ok_youre_ok_thomas_harris_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf0.bin
1fc923b264850fa99c5c1907abd5722ca4b53cca85f5ecb7af7fc1ad6ba8e6dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 5508 bytes
font_01_sfnt_off0000fe90.bin
2fe9e8b1ea301963fb9068ae3b143872d427f99a3658f06988581b83bb8d5043		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 10820 bytes
font_02_sfnt_off00012368.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12368 4324 bytes

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