Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4d45cc248172f6…

MALICIOUS

PDF

80.6 KB Created: 2021-04-20 10:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b8c1cb2bd93bdcf1dc69441eef722c4e SHA-1: 50431244ae46bc1272a03fb32cede41df4164917 SHA-256: ed4d45cc248172f6dcdf8c2095693aa5dbe7ab6ea80938cbef87dbe669fff45a
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/strik?utm_term=toshiba+satellite+l755d-s5130+specs In PDF document text
    • http://nopuvobetag.mygamesonline.org/less_than_zero_full_movie_download_in_hindi.pdfIn PDF document text
    • http://olipaka.xyz/where_do_i_come_from_book_nzf4jwd.pdfIn PDF document text
    • http://indonesia2health.online/lerabiwoputibufutapwyywk.pdfIn PDF document text
    • http://halfraire.xyz/239635659119pjjh.pdfIn PDF document text
    • https://cdn.sqhk.co/baradudapati/ifnyjcT/zombie_strike_brainsaw_blaster_nerf.pdfIn PDF document text
    • http://fofumumitem.medianewsonline.com/jisevowefatamaji.pdfIn PDF document text
    • https://simefaburiso.weebly.com/uploads/1/3/0/8/130814859/nibebika.pdfIn PDF document text
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/6942719.pdfIn PDF document text
    • https://sivusizawijavoj.weebly.com/uploads/1/3/4/4/134482483/supapila.pdfIn PDF document text
    • https://gatamerat.weebly.com/uploads/1/3/4/0/134000446/7557938.pdfIn PDF document text
    • https://nimifitirujaga.weebly.com/uploads/1/3/4/6/134693460/sogowovugoje.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/why_did_they_take_fifty_shades_darker_on_netflix.pdfIn PDF document text
    • http://psychologyrelax.xyz/chrome_free_for_android_phone2j09c.pdfIn PDF document text
    • http://afracheat6.xyz/wipeladobuvuzagawobudiu.pdfIn PDF document text
    • https://cdn.sqhk.co/jivaduzar/0rgfkid/crush_them_all_discord.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://farudigenudoze.onlinewebshop.net/81193126889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c586bd02-dabe-4a45-baa6-520c46b332fb/go_math_5th_grade_workbook_online.pdfIn PDF document text
    • http://baxewape.myartsonline.com/18573300581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ecb594c-9dd1-4675-8e08-c0e08516cd87/4378975207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40fe0a85-12cc-4f88-8a8f-b0e651592055/sujoxezegopu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 5428 bytes
SHA-256: 7874618531f874a8437eaef0330cd6390c16557eedb84e299c954cac52162e32
font_01_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 10836 bytes
SHA-256: 8d1d09384907ad2849fa8067ee1a2c19d900e1aed7d4ba7f2e7249088e27f1b7
font_02_sfnt_off000126ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34