Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa8b81bec1cd0eb…

MALICIOUS

PDF

78.0 KB Created: 2021-02-25 20:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 862f1e6e181d7dd6d810215a68d36137 SHA-1: e1163ebaa34b6546506f5057827a32ba828608bb SHA-256: 9aa8b81bec1cd0eb7046fd1ba808fab731b5a9e0a4f62f878aaf38525630139b
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, suggesting a phishing or link-farming scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/123?utm_term=the+anatomy+of+melancholy+by+robert+burton+wikipedia
    • https://static.s123-cdn-static.com/uploads/4469128/normal_5fc7a8f5edc38.pdf
    • http://dosaxixapaxa.medianewsonline.com/ryobi_12_drill_press_review.pdf
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/vinosid.pdf
    • https://butemupow.weebly.com/uploads/1/3/5/3/135338881/1955309.pdf
    • https://jevebuna.weebly.com/uploads/1/3/4/5/134594548/guzebipipafebi.pdf
    • http://zuzorovix.scienceontheweb.net/where_in_the_bible_does_it_say_it_wont_be_water_but_fire_next_time.pdf
    • http://pozijuza.scienceontheweb.net/bezojajotanufafafesibu.pdf
    • https://cdn-cms.f-static.net/uploads/4474734/normal_600ce4c828814.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kexasejuwodeji.epizy.com/kreg_screw_guide.pdf
    • http://xodubepegiluli.rf.gd/ramebevewizo.pdf
    • http://kofaxafogi.myartsonline.com/sotamuluxopofopizagog.pdf
    • http://vunowowino.epizy.com/black_hole_movie_in_tamil.pdf
    • https://s3.amazonaws.com/fajonubinomeder/international_journal_of_infectious_diseases_case_report.pdf
    • http://rizivubonulej.atwebpages.com/79888921574.pdf
    • https://s3.amazonaws.com/vixuwogetiv/resize_bitmap_in_android.pdf
    • https://s3.amazonaws.com/petikamov/bejexitan.pdf
    • http://vidugozu.atwebpages.com/nurses_drug_handbook_2020.pdf
    • https://s3.amazonaws.com/kotodur/ranekolirin.pdf
    • http://gutekuretejapoj.onlinewebshop.net/multiplication_table_till_30.pdf
    • https://s3.amazonaws.com/wusigipufuvowix/15288712725.pdf
    • http://nujuxat.epizy.com/jifetuguwu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c1.bin
66f41db67bfd07d137bf561beaf21a57b244135c78b18cc75b1fb3f2f6d474cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 5564 bytes
font_01_sfnt_off0001049a.bin
9cddbb3592156a02b87df8105ae5b0423cfeaa4cf948f549dce566a0a7a7fdaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 10800 bytes

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