Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1da870de9c99ad…

MALICIOUS

PDF

94.0 KB Created: 2021-03-25 07:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 28b2d92ab5a22a0c42fbeec92fd06901 SHA-1: e2e143aaf87b2ab4a3ecbe0405c06a15c1e3939c SHA-256: fc1da870de9c99ada294acbafef20226a58811eb63ab05d8f5cacbfd1a95ca41
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing malicious payloads. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent, likely involving the download of a second-stage payload via one of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/award?keyword=alter+ego+1+hachette+pdf+free+download PDF link annotation
    • http://hallop.xyz/jikafiminomugycpus.pdfIn PDF document text
    • http://subbellassecret.com/reading_comprehension_online_games_5th_grade2db6b.pdfIn PDF document text
    • http://vopagokiniki.mypressonline.com/financial_accounting_interview_questions.pdfIn PDF document text
    • http://iranianvc.com/running_a_bar_for_dummiesqba7w.pdfIn PDF document text
    • http://mx50off.pro/novawebuzofutezo13ef.pdfIn PDF document text
    • http://idealicaitalia.website/394785454967z191.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/s._t._a._b._l._e._program.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/walmart_pharmacy_hours_norwalk_ct.pdfIn PDF document text
    • http://getsalon.xyz/bitinekajevipaxon67n8.pdfIn PDF document text
    • http://bijukexamova.scienceontheweb.net/english_business_letters_download.pdfIn PDF document text
    • http://kinorio5.xyz/dusafutowuboxonov9wxfi.pdfIn PDF document text
    • http://buvavarosavadar.iblogger.org/patufesitotesivemofufu.pdfIn PDF document text
    • http://f1l3download.site/zanonorazunewg5001.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vidugozu.atwebpages.com/43653926106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51742f3c-4242-4b2e-815c-02f88df77bda/what_is_paint_in_computer_for_class_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e537d722-6b0b-42de-85f2-f5bc963445d8/jack_reacher_tv_series_cast.pdfIn PDF document text
    • http://xasagode.myartsonline.com/lixefibajudemaxe.pdfIn PDF document text
    • http://tojulov.epizy.com/catia_free_tutorial.pdfIn PDF document text
    • http://niwudovokev.epizy.com/54487897794.pdfIn PDF document text
    • http://timerojulawu.myartsonline.com/email_google_drive.pdfIn PDF document text
    • http://bireses.rf.gd/kesom.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_off00012a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9F 5372 bytes
SHA-256: 7a93b26623de80d208dcf753bba3d09831fe97cfcee99d0606bf0729e86bc1ed
font_01_sfnt_off00013cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFD 13388 bytes
SHA-256: aa3fc1178899d032fdd837e0c9fd52113e27ca89c39d7a49eb68d8c79afddcaf

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