Malicious PDF — malware analysis report

Static analysis result for SHA-256 671efbb088a33bb7…

MALICIOUS

PDF

80.1 KB Created: 2021-04-05 00:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8bb4cd0dde0f943b36e63b101bb4e002 SHA-1: 87d8828452e2bcea5334636b8c5e080cf6e81fa1 SHA-256: 671efbb088a33bb781d4b694c7c4614a8d5c580bd17ea7b068e2987c8376577e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://lozipotod.ru/award?keyword=bull+shoals+lake+map+pdf PDF link annotation
    • https://venubitolaxi.weebly.com/uploads/1/3/4/3/134372432/3417286.pdfIn PDF document text
    • http://kidupat.getenjoyment.net/starting_a_blog_for_dummies.pdfIn PDF document text
    • https://xunumiselodaz.weebly.com/uploads/1/3/0/7/130775676/datebelituragezise.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/jozavugidov.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/computer_basic_knowledge_in_bangla_free_download.pdfIn PDF document text
    • https://bawusazatodopam.weebly.com/uploads/1/3/1/3/131378774/80d347003c12d5.pdfIn PDF document text
    • https://lulipelewofepo.weebly.com/uploads/1/3/0/8/130873877/c05db4e8716a1.pdfIn PDF document text
    • https://cdn.sqhk.co/furaxofir/jf5ggij/65538321199.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/21637740675.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/igicWji/best_buttercream_frosting_recipe_for_decorating_cakes.pdfIn PDF document text
    • https://cdn.sqhk.co/vamapoludi/wv8iejg/bare_root_tree_planting_guide.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/67532241926.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/jqMDWih/android_9_pie_update_phone_list.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/jiWgdhb/warhammer_quest_2_how_do_i_level_up.pdfIn PDF document text
    • https://mufaguzesevulet.weebly.com/uploads/1/3/2/8/132814956/9205019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_97a9cbff78214dd29d5b0f07715ad303.pdf?index=trueIn PDF document text
    • https://00f02ae0-031c-4cf4-85c3-86bbc6d7deb2.filesusr.com/ugd/13f2e4_959adaf918ed45d7a14bd7d86f137be3.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_691c73de63a34e438fc4be42aecf8f70.pdf?index=trueIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_c0d947c7d17d418dbd958f4f052b7e1a.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 5296 bytes
SHA-256: 43530d3ded31c375a1d1482acdc4a12df5c4bdc6d7d5229243adfa3a227fbcdf
font_01_sfnt_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 11268 bytes
SHA-256: e9ec91c366cfe27b4b518b24d02a8b9552d224ffdce1c93aa181a9698ff21983
font_02_sfnt_off00011d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D81 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf