Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b2245d83282caf…

MALICIOUS

PDF

77.1 KB Created: 2021-03-15 04:58:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dcd4c330a7ea1950345f684c2b920e60 SHA-1: 1373f25d682b90bea48776201ec134174bb5aab9 SHA-256: 50b2245d83282caf221772f3058df1374abc061ba49a95141576ad8c17677e9a
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, a common tactic to obscure malicious destinations and evade detection. The document body, though heavily obfuscated, suggests a lure related to 'statistical studies' and 'worksheet answers' to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://jacksth.ru/wix?keyword=statistical+studies+statistical+investigations+worksheet+3+answers PDF link annotation
    • http://ropewelopison.iblogger.org/riachuelo_definicion.pdfIn PDF document text
    • http://gugolufixa.mywebcommunity.org/zuwupoxuton.pdfIn PDF document text
    • http://fulosurexexe.22web.org/27400441640.pdfIn PDF document text
    • https://jujamepusa.weebly.com/uploads/1/3/2/8/132815903/sebewitezugibabo.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/chuyn_t_file_thnh_file_nh.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/36431770616.pdfIn PDF document text
    • http://xidasetetobuge.scienceontheweb.net/hotel_revenue_management_basics.pdfIn PDF document text
    • https://ludatigesoz.weebly.com/uploads/1/3/6/0/136050408/7e31d6467b05.pdfIn PDF document text
    • https://derikuboxema.weebly.com/uploads/1/3/0/7/130776504/e7430d6d.pdfIn PDF document text
    • http://sifimomikev.sportsontheweb.net/grammar_english_checker_online.pdfIn PDF document text
    • https://buxijoxusezo.weebly.com/uploads/1/3/1/4/131483018/695470.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/4a_s_detailed_lesson_plan_in_english.pdfIn PDF document text
    • http://titugol.atwebpages.com/sunbeam_water_cooler_ylr2-5-90hz3_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc40134-f1a2-47b3-9463-af0f5e7cedc6/vawezok.pdfIn PDF document text
    • http://finubovuputok.epizy.com/fotas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8eb925b-fa23-48cf-a40d-35861ffae3fe/fufiv.pdfIn PDF document text
    • http://maxupalilapudot.rf.gd/siri_iphone_6_plus_how_to_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0b0204e-3a13-4fd5-8adb-08f1ec073396/xojodarawetovazosuzer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b7fc2a-fac5-4186-a9e5-c0d409c837fc/missing_411_strangest_cases_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/jugujewasajojutuloborus.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/14235434761.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/tenuzomajopafulazes.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/pafakapuritusola.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 5684 bytes
SHA-256: 8bc491884543caaba2d14b4316cb89a82fdcf776047a3155742f818ff7e67a3b
font_01_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 11288 bytes
SHA-256: 095736364a5f1d20488c790e19306410ba41dcedf4e25935c7ca21bc0df3112f

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