Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bd819dfea6de0e…

MALICIOUS

PDF

87.8 KB Created: 2021-03-11 04:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9749ebd131018689ffb5307ae063ef09 SHA-1: abecc6df5e955c584cd010dd66e511404d6b95a4 SHA-256: c4bd819dfea6de0e6788c80c13d89ba28af70ac855a900366af19a93a4b51770
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding a large number of URLs, with one prominent URL being https://jottigo.ru/123?utm_term=anime+back+street+girl+eps+4. The document body's content is obfuscated and likely serves as a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=anime+back+street+girl+eps+4 PDF link annotation
    • http://fudazozotakaxal.mywebcommunity.org/mevuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/HkmIVie/airline_tycoon_2_geld_cheats_iphone.pdfIn PDF document text
    • http://gusuketip.22web.org/sportdog_sdt00_remote.pdfIn PDF document text
    • http://betukekotulodew.22web.org/wovotaxojunegopama.pdfIn PDF document text
    • http://salukapebuke.iblogger.org/consumer_reports_best_automatic_cat_litter_box.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/iWvjdhc/galaxia_inflation_sailor_moon.pdfIn PDF document text
    • http://pelaberofusej.iblogger.org/vagusefugakukogeripat.pdfIn PDF document text
    • http://basidugom.mygamesonline.org/adenoma_tubular_de_mama.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faxiwig.epizy.com/wajej.pdfIn PDF document text
    • http://sinejelubomidi.epizy.com/lobuvulurasekivusisoxir.pdfIn PDF document text
    • http://sasunuvelew.epizy.com/16329506451.pdfIn PDF document text
    • http://muwenujuwup.rf.gd/pixeligakitusetolaf.pdfIn PDF document text
    • http://nimunofat.epizy.com/allison_2000_transmission_operators_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d227d818-71b2-4baa-bf4f-1a04c8e48b5b/unabomber_manifesto_newspaper_for_sale.pdfIn PDF document text
    • http://wuzuvulas.epizy.com/dajibetuwabojizuno.pdfIn PDF document text
    • http://kijenor.epizy.com/anaganaga_aravind_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55cb9084-3c80-48e6-b09c-d47e5295f674/self-determination_theory_van_deci_en_ryan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c34bd9-5910-44cb-9d29-a8cc0b64f4c9/what_sequence_should_the_marvel_movies_be_watched.pdfIn PDF document text
    • http://vibulowivez.epizy.com/how_to_put_greek_symbols_in_latex.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 15088 bytes
SHA-256: 6c859557ed4d1cd9027b859418562be4977cbb5c3e7c157838900b1f87cff989
font_01_sfnt_off00011a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A68 5532 bytes
SHA-256: 9c8abd878fe76afd504db3de43969b9631ee15a8f34e38d49eca1621f2b0c609
font_02_sfnt_off00012d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2B 10832 bytes
SHA-256: bd4853f258b8bd56fffc32e7f029379c33f221b34b8681e0c8ceb7a3faf0abfc

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