Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbe739f1f289188…

MALICIOUS

PDF

84.9 KB Created: 2021-03-31 10:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 791ae3eef86fc053818247c1ffc6f05b SHA-1: 8a9120cf72fe6165f8ba110df0c2cb3d107c2110 SHA-256: 7cbe739f1f28918801beb11e3103579d1838f8b6cf29e3733e615a48a89526c8
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains text related to a "Pycharm cheat sheet pdf mac", suggesting a lure to download a malicious file. Several external URLs were extracted, some hosted on disposable domains, which are likely part of the attack infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/123?utm_term=pycharm+cheat+sheet+pdf+mac PDF link annotation
    • https://cdn.sqhk.co/tuzevawu/amgidig/292268116.pdfIn PDF document text
    • http://sunugukumota.getenjoyment.net/37553128145.pdfIn PDF document text
    • https://cdn.sqhk.co/pidikuso/ifremDr/seven_sisters_book_review.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/YAThehg/19248015683.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/Eibhbhi/ripijisebuxodizubosove.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/xuripesixuji.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/dgcie94/pictoword_level_87_answer_key.pdfIn PDF document text
    • http://ionatr.space/94053378178655af.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/61501889350.pdfIn PDF document text
    • http://theharaka.online/how_to_reset_my_moultrie_game_camera3wy8o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_4848a7bbe88d4121a52a10cafd8deb2c.pdf?index=trueIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_843cded99bcd4aea874ea2cd15246d86.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_20338c99e0c9446ab6407df21f9c6307.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c44a18-ef15-4920-854e-4cef3c1abae6/can_you_wash_all_clad_pots_in_the_dishwasher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a357a4-d221-457d-af0b-6d486d733f84/duderijexowavaduwukapufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba51f6d2-1acb-4d61-855c-a7f885de6731/82327350574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f099516-82ec-4acc-9cfe-ca61fa883ed4/what_does_the_word_alpha_girl_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/baby_dress_images_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/weather_report_in_bengaluru_karnataka.pdfIn PDF document text
    • https://712e085e-8422-4094-ae2e-709d430f1fc9.filesusr.com/ugd/bf8edb_88bd1f80c9f04cd2b3b5ab4055816b76.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/wezemoxujonoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7837c3ac-d28a-41f6-8cce-c8d242aa2953/whirlpool_refrigerator_water_filter_replacement_video.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 4988 bytes
SHA-256: 55219a8581794bb33599c00b4e2e33a7aa775dd427fe6a9ba770a427e410c50e
font_01_sfnt_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 10584 bytes
SHA-256: 8d786fedee6ac9f263008be6d46709d9bc91d61f6e1e5ca76c03566f80ad12d7
font_02_sfnt_off000120d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D3 16740 bytes
SHA-256: ef493d95f9a70dfe736ae249ed7b112465406fcd2fe03aff563354086a373c92
font_03_sfnt_off000137d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378