Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a50ad7517058d57…

MALICIOUS

PDF

78.3 KB Created: 2021-02-09 06:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4b9375510f292b75b3b9b0d29d841089 SHA-1: 285ed6936a7f58c72d0c0dc15f8a9ded1e276637 SHA-256: 0a50ad7517058d57265fa2cc8c7382ea37175c7def5a8088372f82968ec65a1f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to 'Lost lands 6 walkthrough', which is likely a pretext to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=lost+lands+6+walkthrough+-+part+5 PDF link annotation
    • https://cdn.sqhk.co/remigalakefo/Khchia3/sajevinimaxoruzojusumi.pdfIn PDF document text
    • http://gakarefutejet.iblogger.org/92635282050.pdfIn PDF document text
    • https://cdn.sqhk.co/keserina/iLlfjiC/hoverboard_back_to_the_future_skateboard.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455670/normal_5ff0e99541532.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/coursera_deep_learning_course_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452834/normal_6021eb7228f99.pdfIn PDF document text
    • https://lizuxafemow.weebly.com/uploads/1/3/0/7/130776517/pudujovado.pdfIn PDF document text
    • https://cdn.sqhk.co/joremeve/hg5idk1/70464694266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488332/normal_6014f6092d770.pdfIn PDF document text
    • https://jomaredavox.weebly.com/uploads/1/3/2/3/132302995/mogirupetisuxi_duwudeje_galuluj_vologusoxoma.pdfIn PDF document text
    • https://dezuvatag.weebly.com/uploads/1/3/4/6/134667454/9324838.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473044/normal_5fcf21327a880.pdfIn PDF document text
    • https://zigakenipipoto.weebly.com/uploads/1/3/4/1/134131781/6114275.pdfIn PDF document text
    • https://fepepifufom.weebly.com/uploads/1/3/1/8/131872298/d39f058.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://roduteberilexel.epizy.com/arduino_programming_basics.pdfIn PDF document text
    • http://bisavosimirot.rf.gd/73071591531.pdfIn PDF document text
    • http://wipidomi.rf.gd/rugudefisepizovo.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_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 5344 bytes
SHA-256: 1cc79e3cb6f2ed71abe80c15be1c7382d8794a2c8bbe7c7100adcfbed3b25400
font_01_sfnt_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 10244 bytes
SHA-256: e8ef6c83bf9f8f27d33690eb3f08a3ff743acb3cef0ddcecc24df06242ee862b
font_02_sfnt_off00011d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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