Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa679c8f1e80d215…

MALICIOUS

PDF

73.6 KB Created: 2021-03-27 18:53:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4a97afc307d5adecbe7f898c87a18a0 SHA-1: d864a800ae4a25e6eab48d43f15fd7d21dab02ff SHA-256: aa679c8f1e80d2156fcea0335fe123707daebd04aa1970e455a9648e66a3a520
104 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV detection and an ML classifier, indicating it's a phishing or trojan PDF. The presence of multiple external URLs, including one with a filename suggesting a downloadable PDF, points to a likely download lure. The document body, though heavily obfuscated, contains text related to 'monthly expense worksheet printable', reinforcing the lure. While no scripts were explicitly extracted, the PDF structure and external links suggest it may attempt to exploit vulnerabilities or redirect the user to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/123?utm_term=monthly+expense+worksheet+printable
    • http://joxitikoki.getenjoyment.net/learn_spanish_book_free_download.pdf
    • http://exampl1214.com/93218486729x5n88.pdf
    • http://hookup673.site/17931111934xcnk5.pdf
    • https://cdn.sqhk.co/nikofejujel/ifBhbhj/gulivalazoxiwe.pdf
    • https://cdn.sqhk.co/dokadajij/jihghc9/84950504919.pdf
    • https://cdn.sqhk.co/moxibusas/jchgAid/weezer_say_it_ain_t_so_year.pdf
    • https://cdn.sqhk.co/wepiwuvume/0HU0hie/hijacker_jack_famous._rich._wanted_apk.pdf
    • http://begdas.fun/ethical_pathways_of_internal_audit_reporting_linesc55bo.pdf
    • http://regvoolkim.website/tepewututk8bsi.pdf
    • https://cdn.sqhk.co/juzosugun/eoSjfhj/oversized_wine_glass_centerpiece_ideas.pdf
    • http://webmastervlad.ru/troy_bilt_riding_lawn_mower_drive_belt_replacementiw3da.pdf
    • https://cdn.sqhk.co/legesizas/cacK6hi/good_tik_tok_background_music.pdf
    • http://wiboratiraveguw.mygamesonline.org/application_software_tutorial.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kovezux/2427734386.pdf
    • https://s3.amazonaws.com/gotenukevepunin/lexemogevewurimob.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/kewinepiviboxonazanuru.pdf
    • http://ligiwekuxote.myartsonline.com/82883907416.pdf
    • https://s3.amazonaws.com/tesodagiwor/53517924526.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/most_common_phrasal_verbs_ielts.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_off0000df27.bin
299458f2a19724ec7958d7ac5196d7eddab77cf2ed74762f32e4e941ba23c449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 5376 bytes
font_01_sfnt_off0000f18a.bin
83c4f93172066dda6414715e5ced9fd9cba646b6accf1c871056f6b66128d629		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 11084 bytes

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