Malicious PDF — malware analysis report

Static analysis result for SHA-256 4780aad133528791…

MALICIOUS

PDF

76.0 KB Created: 2021-05-12 23:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d51880327e4c5ee0e371934c73abb51c SHA-1: 89a87799efb737ce0e772bcfa827ab5de65e5912 SHA-256: 4780aad133528791d3ae77dc295490c718a37fdefd461aa716d7b0b8c4cb9fec
146 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. It uses a callback-phone (TOAD) lure. 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/strik?utm_term=adidas+watches+for+men PDF link annotation
    • http://rijupoxog.22web.org/cymatic_audio_utool.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/powakula.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwebuvowo/fIFieH0/bibitonozurutusidedumukor.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/hjsLMid/english_to_tamil_dictionary_offline_app_download.pdfIn PDF document text
    • http://tibojokotetus.iblogger.org/elementos_del_genero_dramatico.pdfIn PDF document text
    • http://xomaweluk.22web.org/free_purchase_agreement_template.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/Yichfql/free_pop_radio_online.pdfIn PDF document text
    • http://zukesijinizik.mywebcommunity.org/convert_microsoft_word_to_on_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/dWiithf/red_velvet_cake_recipe_in_malayalam_language.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_3e73dab7dd1f45efa956f7a876508bba.pdf?index=trueIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_0e6b127f87c646cf95cdd4f9a8074f01.pdf?index=trueIn PDF document text
    • http://tuxalazurasel.epizy.com/58474413793.pdfIn PDF document text
    • http://dozudaz.epizy.com/lefuvugepuzesirutipebu.pdfIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_336395c6093741bb8394fa45d0de7da7.pdf?index=trueIn PDF document text
    • https://6552665f-f3ce-4070-9f47-7b493df4570a.filesusr.com/ugd/3d88c7_e3c19764efc2481f93641e4bfd1212e3.pdf?index=trueIn PDF document text
    • http://kifofok.epizy.com/how_to_solve_absolute_value_inequality.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_c89eb0215c464a77804313fac2e8c55e.pdf?index=trueIn PDF document text
    • http://tipavebapijax.rf.gd/fabar.pdfIn PDF document text
    • http://mizetum.onlinewebshop.net/organic_chemistry_notes_a_level.pdfIn PDF document text
    • https://69b12d55-863e-458e-a545-ad358ed6bd1a.filesusr.com/ugd/a9642c_526b7dad31b7450abc6fcb47946d2012.pdf?index=trueIn PDF document text
    • http://vidobif.epizy.com/nilobawiwe.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_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 5308 bytes
SHA-256: f99f46dcdd8b173f1e052c55f5498e417f7b8a8bc7dca9d7fb0a4a31e1de2bdd
font_01_sfnt_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 11372 bytes
SHA-256: 260023a34bceb1042f15279554d148bac07699a71d793446e874021b2d6585ef
font_02_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e