Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9587ffe375f545…

MALICIOUS

PDF

83.8 KB Created: 2021-03-10 04:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f5888c0bb93d08d3aa08f212892d9177 SHA-1: a117f0711a733353a4384a85cfcad8c0d5089fad SHA-256: 7c9587ffe375f5455c8b472c2155aed7ab0d61b0a8a956d536222f98b9d8b7fc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The presence of a URL with a 'happy birthday' keyword suggests a lure to attract unsuspecting users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/wix?keyword=happy+birthday+son+in+law PDF link annotation
    • http://likedizar.medianewsonline.com/bakejekenexusozubaledu.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/how_to_connect_canon_mg2520_printer_to_computer.pdfIn PDF document text
    • http://buvofigutunam.22web.org/paying_a_charge_off_on_credit_report.pdfIn PDF document text
    • http://tejowigasinafu.getenjoyment.net/how_to_create_a_comparison_sheet_in_excel.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/rixitatugaxiwogixares.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/sri_bhagavath_geetha_malayalam_text.pdfIn PDF document text
    • http://pirewarekow.mywebcommunity.org/how_much_would_it_cost_to_start_a_baking_business.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/worimefupepanedijuk.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/i_pace_max_charge_speed.pdfIn PDF document text
    • http://rulabepotinujeb.mypressonline.com/what_is_a_single_member_llc_vs_llc.pdfIn PDF document text
    • http://kazoxizodasese.iblogger.org/43826066808.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/survival_gear_list_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_6eb0060b46a04a699111b31a16f3464d.pdf?index=trueIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_148ac64d24a94e889437945e758a1b5d.pdf?index=trueIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_f46de6d9349f4d5eb92a89e3c609f1f2.pdf?index=trueIn PDF document text
    • http://tulajadulixo.myartsonline.com/5566734486.pdfIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_d6d7ab55ee6c4daeb955c0ca04eda7cc.pdf?index=trueIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_6ed2a1f815cf4f53a8012e5128804260.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_861aa247fccb4f13b4c38d1971e1c82d.pdf?index=trueIn PDF document text
    • http://kupavojos.epizy.com/2_nephi_19_meaning.pdfIn PDF document text
    • http://puribisipup.atwebpages.com/tivojol.pdfIn PDF document text
    • http://zurogizezina.rf.gd/25294520654.pdfIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_ce18c7f5a327480490db933a6aab8dbd.pdf?index=trueIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_849b22c805624bfbaf46e39a4168fb8c.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_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 5344 bytes
SHA-256: 811724d2ab5b583525ed32d66ee31e71139e6b640235fd0f3b70c11cebefccc6
font_01_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 10284 bytes
SHA-256: 6b36cd17e04e14c0cf2aedbac52fe1adfc78a508329171e3ed9bb73882ba2442
font_02_sfnt_off00012c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C63 16168 bytes
SHA-256: 8c1e3298cb301b6aa2c2aeff0a89e1cafee6626e56d5ffa98ad52a7598c40df9