Malicious PDF — malware analysis report

Static analysis result for SHA-256 70141be296fbeda3…

MALICIOUS

PDF

128.1 KB Created: 2021-04-08 06:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7602c7e307195cfbe68a91af9ac4e84 SHA-1: 9fcb1a414468112e760bf9168b23f8a252966694 SHA-256: 70141be296fbeda3c99431df0618e661d8ee3adb78188383760e64d204d9ff99
186 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents hosted on various domains. The primary URL, 'https://vilenefex.ru/123?utm_term=conservation+of+momentum+worksheet+doc', suggests a lure related to educational content, likely to trick users into downloading malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=conservation+of+momentum+worksheet+doc
    • http://vozajomaralamer.mygamesonline.org/wuzufip.pdf
    • https://cdn.sqhk.co/xulawajikigi/eVnEIjc/falling_in_love_netflix_wiki.pdf
    • http://suwubiwutej.iblogger.org/87301970755.pdf
    • https://cdn.sqhk.co/pategazikiw/dymidji/3960273866.pdf
    • http://xupokaxe.medianewsonline.com/sherlock_holmes_short_stories_sir_arthur_conan_doyle.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_bd771aa9900e43cea6424a99f08cf563.pdf?index=true
    • http://polilofu.onlinewebshop.net/barnyard_dance_book.pdf
    • http://sibexelopuni.epizy.com/are_wolf_ovens_worth_the_money.pdf
    • http://lawakeweba.epizy.com/custom_action_bar_search_in_android_example.pdf
    • https://f19d2187-ce67-4d04-8798-eef694565169.filesusr.com/ugd/bd4746_a7337d1772334f919275a74fd41d47c0.pdf?index=true
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_37741a6d9ae14ea8808d3609667d6e19.pdf?index=true
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_0e1a6bf2099644a88b63675cf76bd410.pdf?index=true
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_eaf0c5c2ff744ab7921aa3ef11881628.pdf?index=true
    • http://tanewibuzak.epizy.com/bugometenexutopiju.pdf
    • http://belibivizonojo.myartsonline.com/articles_of_confederation_worksheet.pdf
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_e0411069221f4438bf1f45c7de0d4811.pdf?index=true
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_29a7cfc02bd746e2b1b967b98d2f711b.pdf?index=true
    • http://vonimamodiji.rf.gd/best_flirty_questions_to_ask_a_girl_on_tinder.pdf
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_9b5271acc3a3445abfed36e425fad209.pdf?index=true
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019296.bin
1e75816bcfbeed5a6ecb86cc18eff31d9e3c8cddabe4d1bfc66e2b55f900d43d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19296 6920 bytes
font_01_sfnt_off0001a3f2.bin
bd04b8412b333df4f5c9693fc0541b38ddfef60a6b914cf6114af65e9e83cd8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3F2 3072 bytes
font_02_sfnt_off0001aee8.bin
87bb61a2656153406fd9ee48d80ec3cd33f1b97f3481877b856ec78c9c5f0681		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEE8 5352 bytes
font_03_sfnt_off0001c106.bin
7cb062fcfd5192e16b9902f8c5ee67f7dc0b553312068b547ce466e79c731f96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C106 14236 bytes

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