Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2757a8ee3238ad…

MALICIOUS

PDF

74.2 KB Created: 2021-02-27 16:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5a7109aae02283ba9cf56ae06a303600 SHA-1: 80f1913705c815dc92e31f2b47cf07fce3273c30 SHA-256: de2757a8ee3238ad11f906e9292167e360697cb0a95205403d2a1f7cd21f9390
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

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://jottigo.ru/award?keyword=stephen+king+new+book+2020+if+it+bleeds PDF link annotation
    • http://beststudent.space/gana_prabha_ambedkar_song_video5bzeo.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/ijig7hi/best_video_calling_device_for_tv.pdfIn PDF document text
    • http://infokurs.design/corporate_finance_salary_guide3ze37.pdfIn PDF document text
    • http://meetsalle.xyz/fender_passport_150_pro_review4w2ep.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/jihfVjh/the_art_of_war_2_trailer_deutsch.pdfIn PDF document text
    • https://cdn.sqhk.co/mezomabesoki/wqjhhsq/smartthings_motion_sensor_battery_hack.pdfIn PDF document text
    • http://spindlndou.space/wevasir2950g.pdfIn PDF document text
    • http://podcard2020.site/zatuwusunuvodiwirelar8z5wx.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/jcjgc7d/ridesajamu.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/lovukakavedep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taborodadux.rf.gd/56613194749.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/borekip.pdfIn PDF document text
    • http://gikosetopetidun.rf.gd/45227527316.pdfIn PDF document text
    • http://fufabufitilaf.epizy.com/60398701602.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/aprilia_rs_125_manual_2008.pdfIn PDF document text
    • http://kasisexa.rf.gd/36456084865.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/75561081717.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_off0000e42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 5672 bytes
SHA-256: b4226578df4f6a80d91edf64fdacdc4b49b1a45c121faab599dd0884bc8fe5e3
font_01_sfnt_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 10560 bytes
SHA-256: e672f7fe9644a65040f7b1aa2cbef6d12be62418c99579d1c42fbb5526007c14

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