Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef1c39fd0fbb284…

MALICIOUS

PDF

89.0 KB Created: 2021-03-16 22:52:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b4d9e3fd7a090433bc7400e7f60c775f SHA-1: 53bb3e76f7de224aa8007e7f778854afaaa077c6 SHA-256: 1ef1c39fd0fbb28429810f67a760ab152bb38f541d2628d80b005e1016a70392
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 0.9996

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://leonvi.ru/strik?utm_term=how+to+get+revelation+ffxiv PDF link annotation
    • http://sopidemeleket.mygamesonline.org/94317527574.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/hghawf5/mega_millions_nc_past_drawings.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/jijhmma/2015_college_football_championship_stats.pdfIn PDF document text
    • https://rasafidi.weebly.com/uploads/1/3/0/7/130776861/c9693.pdfIn PDF document text
    • https://gopufijubasid.weebly.com/uploads/1/3/1/8/131856987/bokepasetiwuzaf.pdfIn PDF document text
    • https://cdn.sqhk.co/samekikogeri/hbgfif8/cartoon_cat_garry_s_mod_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lekuruzomef/bNtjc7s/airthings_wave_plus_apple_homekit.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/idjcAid/zafiwuku.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/e6jiKhd/snowman_story.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/Tjfgcgi/stick_dragon_fighter.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/jTnIC7y/the_potato_factory_movie_cast.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/how_to_reset_joey_hopper.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d99072b-8610-4db3-a53c-559afbd8fef8/what_is_human_computer_interaction_degree.pdfIn PDF document text
    • http://fogovulosuzan.onlinewebshop.net/lubumiranerimofixujiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c69f1bf4-4718-4f08-abca-6918b08f8775/lean_ux_canvas_template_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a9c16de-0815-48b9-8c98-d9962f445012/70080732757.pdfIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/anunnaki_tablets_of_destiny.pdfIn PDF document text
    • http://lebodixo.epizy.com/puwedefiwovutuvawalozux.pdfIn PDF document text
    • http://rejefuwozumij.rf.gd/26934069965.pdfIn PDF document text
    • http://zimuwujirosi.rf.gd/is_speed_queen_the_best_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d08a74-61c4-41d8-90a3-dc2ecc5cc9ee/80264516009.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F9 4940 bytes
SHA-256: 3527308e7f31bdabebb507cbadc97d0b2111eccec698f5d7094013a412b9ce19
font_01_sfnt_off00011af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF8 11112 bytes
SHA-256: 40523c943da322aa8cfef813c89da3ae55280ad30853394c9a4adb45fc5fa9ca
font_02_sfnt_off00014133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14133 16212 bytes
SHA-256: 1ee85d9b2018e03fb2545c7bdfd18aab3c4871b38cdebbbadf2790f840b53384