Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ae2d1368477577…

MALICIOUS

PDF

85.9 KB Created: 2021-04-03 01:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4265340fba9841d3c1ad89ecba610c45 SHA-1: 67ad375cb8a083c458e07e6b10d60dd931ceb7da SHA-256: 45ae2d1368477577e4204491b4e30b6514938e4cf5c747e8ac1930a181d3ed92
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 link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns, likely using embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/strik?utm_term=dell+optiplex+390+sff+ram+upgrade
    • https://cdn-cms.f-static.net/uploads/4380699/normal_604daa0930c51.pdf
    • https://cdn-cms.f-static.net/uploads/4477886/normal_604ce5cc01625.pdf
    • http://disadijemedox.22web.org/accounting_and_financial_management_for_mca.pdf
    • http://martans.space/oxford_accounting_dictionary1vbw5.pdf
    • http://kupiokno.su/britax_boulevard_car_seat_instruction_manualwmzu0.pdf
    • https://static.s123-cdn-static.com/uploads/4492250/normal_60007b0090bec.pdf
    • http://puwisagoki.22web.org/what_is_the_full_form_of_mice.pdf
    • http://stebsmeh.space/chaalbaaz_full_movie_openloadj3b7m.pdf
    • http://amsidgi.xyz/best_video_games_to_play_at_school4cezi.pdf
    • http://atomlinux.com/waxiwodujupekejegevimarenab2px.pdf
    • http://ductsunlimitedins.com/how_much_does_an_engineer_earn_in_dubai3smy7.pdf
    • https://cdn-cms.f-static.net/uploads/4392872/normal_5fdc249a83d2d.pdf
    • http://usejus.club/2008_honda_odyssey_radio_code_error_ei3lbr.pdf
    • http://weareanonymous.org/19251374304v8toq.pdf
    • http://ipoteka.net/dusutituzokuziwi7lls2.pdf
    • https://cdn-cms.f-static.net/uploads/4477635/normal_5fe7d8992ccc1.pdf
    • http://perexifolelave.iblogger.org/career_chart_after_12th.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/banula/usb_modem_application_android.pdf
    • http://xapesosav.epizy.com/73448985626.pdf
    • http://wutazujedumixa.rf.gd/cardiac_cycle_quiz.pdf
    • http://sibisewol.rf.gd/tetupuvupudu.pdf
    • http://zamonile.epizy.com/69134012119.pdf
    • http://visunizuze.epizy.com/gozutufowufokijazazono.pdf
    • http://mejesikuwuvaxax.rf.gd/9073101134.pdf
    • https://s3.amazonaws.com/limewub/esl_emotions_worksheet.pdf
    • https://s3.amazonaws.com/rimejiguvif/bbc_iplayer_not_ing_on_ipad.pdf
    • https://s3.amazonaws.com/rewepalazamiso/45425362488.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_off00010e5e.bin
7fe3e1b9c379b6b450435757da1df9ac5fd08ae3f6ae2c1480e9c7b8ac6e21c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5E 5888 bytes
font_01_sfnt_off0001225d.bin
ff28f80a1561290bdbf1feff9020bc275b258c46eefc0431d14456fa709f5706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 11356 bytes

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