Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb7882075a92cd6…

MALICIOUS

PDF

75.3 KB Created: 2021-04-04 18:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: dc07a861b13df3a5e190c5fe2c6c8083 SHA-1: f3f85ad954ee07cb09652fc338768a76fdfcd970 SHA-256: 4fb7882075a92cd625cc379142e7a59d1b6b411fc35e682d771580fbc2d7b55e
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the use of disposable hosting and link farming tactics, reinforcing the phishing/malware distribution pattern. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/wix?keyword=composite+figure+area+worksheet PDF link annotation
    • http://sanejuvarasukip.iblogger.org/eat_right_for_your_blood_type_b_positive.pdfIn PDF document text
    • http://nuzenurego.22web.org/how_to_say_i_am_a_nurse_in_spanish.pdfIn PDF document text
    • http://tafiwon.mywebcommunity.org/82467816545.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/how_to_set_my_adt_alarm_at_night.pdfIn PDF document text
    • http://megivisu.22web.org/david_ludwig_always_hungry.pdfIn PDF document text
    • https://tudadakamoziv.weebly.com/uploads/1/3/4/5/134596668/63d717.pdfIn PDF document text
    • https://cdn.sqhk.co/pukikojat/lXiciai/18596584261.pdfIn PDF document text
    • https://zutiwijutorezaz.weebly.com/uploads/1/3/4/3/134354078/f9f6490.pdfIn PDF document text
    • http://fomigiv.mypressonline.com/crusader_kings_2_cheats_steam.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/rOjbgex/take_lessons_live_login.pdfIn PDF document text
    • https://cdn.sqhk.co/najafizox/njbieyQ/blood_money_film_songs_free.pdfIn PDF document text
    • https://pagafika.weebly.com/uploads/1/3/5/3/135339488/meziwu.pdfIn PDF document text
    • http://tesugujinarijag.mywebcommunity.org/55974515006.pdfIn PDF document text
    • http://punejew.mygamesonline.org/89013773206.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/cFvrsJS/wufubupuretorunozi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wamilexujiweni.epizy.com/6554498139.pdfIn PDF document text
    • http://tivekanudoz.rf.gd/bearing_selection.pdfIn PDF document text
    • http://dinedolorexos.rf.gd/of_mice_and_men_book_summary.pdfIn PDF document text
    • http://juborekif.atwebpages.com/how_much_does_a_nutritionist_cost_in_florida.pdfIn PDF document text
    • http://karudopinu.rf.gd/double_down_blackjack_definition.pdfIn PDF document text
    • http://magobugibex.epizy.com/after_effects_expressions_marcus_geduld_download.pdfIn PDF document text
    • http://gulodolowupusaf.epizy.com/58664698599.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 6988 bytes
SHA-256: d46dea5c5ec18e60b2fb2a46d4177dff614a3262d4c804d3c42e101951a74a87
font_01_sfnt_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 5344 bytes
SHA-256: 829bb6a4e2f0d15350c6f12ca945659cc017e592118c643389c873b5c3465f42
font_02_sfnt_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 10476 bytes
SHA-256: 568b02a7cc2ea2e981d44cfe3cfbdf98c61766251aad7eaf3e3e28e1ea4bb0c1