Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51ea60a1c2d48f9…

MALICIOUS

PDF

96.5 KB Created: 2021-02-19 19:16:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9462887f4d1495f08410f884875b041e SHA-1: 6c64deddd4fd4661ad99317345dea2c3e9d871cb SHA-256: c51ea60a1c2d48f9b2d7234fc2c78796729ff5d6002a5c3d9c77ecf662fb2f93
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many hosted on disposable domains, forming a link farm. The document body, though heavily obfuscated, suggests a lure related to 'score tables', likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://seumenha.ru/wb?keyword=tabla%20de%20puntaje%20psu%20historia PDF link annotation
    • https://cdn.sqhk.co/wuzexesetaba/jbZhgih/world_beautiful_girl_full_hd_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/hGjbjaG/85415360284.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/9iiYieg/wordscapes_search_rules.pdfIn PDF document text
    • https://lijotabele.weebly.com/uploads/1/3/4/0/134016876/fipoxadade.pdfIn PDF document text
    • https://wedikeme.weebly.com/uploads/1/3/1/6/131606111/wafurigovo-vakepeluw.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/hbxvhdN/11714448183.pdfIn PDF document text
    • https://zuvagojajom.weebly.com/uploads/1/3/5/3/135398962/vowineno.pdfIn PDF document text
    • https://fosuwelu.weebly.com/uploads/1/3/2/6/132695698/2746504.pdfIn PDF document text
    • https://gusizamavuva.weebly.com/uploads/1/3/4/6/134629738/1002220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389604/normal_5ff1efe019f4e.pdfIn PDF document text
    • https://cdn.sqhk.co/labojime/Gibigid/download_game_angry_stickman_4_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403819/normal_5febb2bb015e9.pdfIn PDF document text
    • http://my-credit.info/balemuzukajanupe4wuo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383571/normal_5ff89271e9bab.pdfIn PDF document text
    • https://bobuwazubugomu.weebly.com/uploads/1/3/4/4/134494734/lixivibe-baxikixofusev.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/5iazchb/stunt_school_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/pamezuravuno/gjMVjck/81434294387.pdfIn PDF document text
    • http://kudretbozaci.com/kawevapxxp7o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • http://www.daltonmaag.com/In 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 5096 bytes
SHA-256: 743dc92aa78a9dc23b270d5ca1920b86137375fec21511fdcbaab084695cd56f
font_01_sfnt_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 2112 bytes
SHA-256: b01132c29b4de4ba217784018f882230d961e5c2bd6a3a26d5b569cd8a1845ae
font_02_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 8460 bytes
SHA-256: 928f38fe43ec23c027b8ea29fd0408c296c324116f755c3d3ea32980f546cf9b
font_03_sfnt_off00011876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 12372 bytes
SHA-256: d243c6c862a7ee9364cac6c2c83790d75de176f88470d51710c75135e541922b
font_04_sfnt_off00014083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14083 2884 bytes
SHA-256: 7747b9151ed9cf966ae4bcb7ccc284507bbff919c859024db6d3f2322df9042b
font_05_sfnt_off00014bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDD 16880 bytes
SHA-256: f8b6ee06ddebd889190ce03c38e41b187549b27c001b9e6ebd33267c9d300085
font_06_sfnt_off0001632a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1632A 4324 bytes
SHA-256: 8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd

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