Malicious PDF — malware analysis report

Static analysis result for SHA-256 734226fa49bfe30c…

MALICIOUS

PDF

79.6 KB Created: 2021-04-10 05:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8c7a4f5b166ae3e482e94f8125d29a8d SHA-1: 637a30478ff0c7c7128f1803329a429eb4ce9fe0 SHA-256: 734226fa49bfe30c22cb97fb6a130447af57100fab161298486b10cdf5f95e40
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

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://resalured.ru/strik?utm_term=five+dysfunctions+of+a+team+assessment+pdf PDF link annotation
    • https://cdn.sqhk.co/vozofugova/Ehcjihb/dope_wallpaper_for_android.pdfIn PDF document text
    • http://samyog.ru/wabibovakodixim920jx.pdfIn PDF document text
    • http://gooddevice-online.com/ap_physics_1_barronsj6loo.pdfIn PDF document text
    • http://laitlabs.pro/zafenoe0yl.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/11916007300.pdfIn PDF document text
    • https://cdn.sqhk.co/nibubovixif/hcZgjid/kansas_demolition_derby_schedule_2019.pdfIn PDF document text
    • http://kebuwakuje.medianewsonline.com/classroom_vocabulary_worksheet.pdfIn PDF document text
    • http://galajikimozupu.iblogger.org/gomobexoxogivoxari.pdfIn PDF document text
    • http://poradoit1.site/star_trek_beyond_jaylah_vs_manasb418s.pdfIn PDF document text
    • http://stroiline74.ru/aws_certified_solutions_architect_study_guideh4789.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/gfAjgjg/12529847573.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/54398439839plxpa.pdfIn PDF document text
    • http://good-production16.site/piano_man_lyrics_brandy_norwoodptg2b.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/siemens_pure_7bx_ric_hearing_aids.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biburusig.myartsonline.com/calculus_early_transcendental_2nd_ed._briggs_cochran_gillett.pdfIn PDF document text
    • http://bideliv.rf.gd/kulisora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeeb0498-4d81-478d-a73d-e13c78f04646/81261439625.pdfIn PDF document text
    • http://bajofot.epizy.com/black_sabbath_paranoid_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae52a2b-b04a-4eb8-98ff-1fc1ff2a84dc/43689642174.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 5288 bytes
SHA-256: d2b0331d84d89478b70048348265a45acd0b7ffc776f0b8d9f9787f19def7d96
font_01_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 10456 bytes
SHA-256: 2963116db55442854cc3f4ea9d98500d868fadfb22ccfd271559f91edfe12f7d
font_02_sfnt_off00011ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA6 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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