Malicious PDF — malware analysis report

Static analysis result for SHA-256 65190495d6ef25c9…

MALICIOUS

PDF

83.0 KB Created: 2021-03-21 12:20:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ed9b1da178cdfe91728aa8ed696bbcb2 SHA-1: 97ec3a11cdfdd5e378958922b1ff0c1a9f2430c0 SHA-256: 65190495d6ef25c9e12d0e9bb2d80b53e0706038abd69ec55596b0196524e020
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 embedded URLs, many of which point to disposable hosting or are part of a link farm, suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, appears to be a lure related to 'naming alkenes practice with answers pdf'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/award?keyword=naming+alkenes+practice+with+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475582/normal_5ff1bcafa1a98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_604747fca7159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_6047bd13e1fe4.pdfIn PDF document text
    • https://cdn.sqhk.co/barosevarega/htjiiih/kajikajivonasa.pdfIn PDF document text
    • http://jakafat.22web.org/mrityunjay_novel_download.pdfIn PDF document text
    • http://zikebuse.iblogger.org/giraridusexagori.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/jjgfK01/gardenscapes_ipad_cheats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_60446dafa6133.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368228/normal_5fe48c7f206b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://regovud.epizy.com/where_can_u_watch_defending_jacob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41049c19-f246-4299-ae62-2c8874014035/red_harvester_ant_sting_symptoms.pdfIn PDF document text
    • http://zoninenawumu.epizy.com/sokepapuniwog.pdfIn PDF document text
    • http://kexemejalo.epizy.com/31174586865.pdfIn PDF document text
    • http://dipumekamerara.rf.gd/how_to_find_serial_number_for_adobe_acrobat_9_pro.pdfIn PDF document text
    • http://rogofijanititad.epizy.com/2016_all_tamil_dubbed_movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dbe103f-fbeb-454b-99b4-d7a0646fea2f/what_is_a_smart_car_battery_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d7a0bbf-d539-492c-8049-eea7a4e757d5/the_labour_law_meaning_in_hindi.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_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 5692 bytes
SHA-256: 7a65df2a9feaf7255147448e0516c44c272478508c5e5f61a4a7e1a6a45f6cfa
font_01_sfnt_off0001182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 11384 bytes
SHA-256: 416d0bb86f22f973e79eee6069b6bfa4cf9bb8f6f427c1d1623bc72c35e2b060

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