Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2acd08142f20ae7…

MALICIOUS

PDF

80.8 KB Created: 2021-04-04 12:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c0e905cd31727e126715e7204004ec11 SHA-1: 1a05a5ca9ae0604e0845a9d70bed32cdbaf7d464 SHA-256: c2acd08142f20ae77166ebd1f590d5f5d7cadd0d74262ebd2830cb22d5d0b31c
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting an attempt to distribute malware or phish for credentials. The document body, though heavily obfuscated, appears to be a lure related to an academic syllabus.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=up+b.+ed+entrance+syllabus+2020+pdf PDF link annotation
    • http://butomuzadizur.iblogger.org/crossbill_guides_southern_portugal.pdfIn PDF document text
    • http://runavowof.22web.org/canaux_bell_fibe.pdfIn PDF document text
    • http://dobikan.22web.org/rumex.pdfIn PDF document text
    • https://cdn.sqhk.co/leguzufaju/Ligifjb/fopakepikox.pdfIn PDF document text
    • https://mapizijef.weebly.com/uploads/1/3/4/4/134493838/dufotibejaveluvijigu.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/g7jgcjf/down_the_hill_podcast_apple.pdfIn PDF document text
    • http://wuvudazesog.22web.org/todarudumuk.pdfIn PDF document text
    • http://rusadezebep.mygamesonline.org/how_many_chapters_are_in_chronicle_of_a_death_foretold.pdfIn PDF document text
    • http://wopebexe.66ghz.com/xulakulow.pdfIn PDF document text
    • http://wasezaxopana.22web.org/tufobu.pdfIn PDF document text
    • https://mikezopa.weebly.com/uploads/1/3/4/3/134366842/muverodifaj-bivifo-jopugudeje.pdfIn PDF document text
    • https://radolawijukigi.weebly.com/uploads/1/3/5/9/135992833/c49785c4e161b3.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/fiwolowa.pdfIn PDF document text
    • http://xelipev.22web.org/contemplate_in_sentence.pdfIn PDF document text
    • http://kadaxejob.mypressonline.com/25759781034.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/como_funciona_una_caldera_industrial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogonuvusawi.epizy.com/ajahn_chah_still_forest_pool.pdfIn PDF document text
    • http://xurorovesi.epizy.com/59898624453.pdfIn PDF document text
    • http://gizolon.epizy.com/exercise_present_simple_tense.pdfIn PDF document text
    • http://gitodake.myartsonline.com/exercices_d_atomistique_et_liaison_chimique.pdfIn PDF document text
    • http://pugamob.rf.gd/fly_ash_bricks_mixing_ratio.pdfIn PDF document text
    • http://tunufefenus.rf.gd/chamma_chamma_video_songs_2018.pdfIn PDF document text
    • http://mojozore.myartsonline.com/the_lake_house_explained_reddit.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 5688 bytes
SHA-256: 53d1e6e20d39b894fb6899a95f98dd117a2025d023e0ba91d70fb560c8b1654a
font_01_sfnt_off00010f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F25 10772 bytes
SHA-256: 86e4203e35dfc92b24f78fa96dedfcf26d48a6bcc6d91ecac871945f78f5c1c2

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