Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2a902d691c0168…

MALICIOUS

PDF

76.1 KB Created: 2021-03-12 10:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 656d76731e52192d7165edad47e8c153 SHA-1: 9bdf9e9ed546c42da938d53f77d103f77dc82bd0 SHA-256: 9c2a902d691c0168656cd6ff510a81feacb57d45b7053a6294de6d991727ad0b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains a title related to anesthesia, likely a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=how+fast+do+you+fall+asleep+with+general+anesthesia PDF link annotation
    • http://kurixuj.sportsontheweb.net/nogoxolunusunuginegos.pdfIn PDF document text
    • https://pujonavow.weebly.com/uploads/1/3/5/9/135958036/tulevifufu.pdfIn PDF document text
    • https://nejuxudukekiti.weebly.com/uploads/1/3/0/8/130874136/b1b35.pdfIn PDF document text
    • http://fefosawixamuwow.22web.org/bollywood_movies_2018_sites_free.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/kotakit_daliwur_zizagu_xulubuzoba.pdfIn PDF document text
    • http://xuponigivixi.66ghz.com/bhangi_video_song.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/2_person_card_games.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/af81f4ba0d4e.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/metal_gear_solid_5_phantom_pain_cheat_engine_resources.pdfIn PDF document text
    • http://dikuziropuviv.22web.org/2013_jeep_grand_cherokee_3.0_crd_review.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/1393835455.pdfIn PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/69927.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dolasuwukino.epizy.com/45504295281.pdfIn PDF document text
    • http://likewiwojuxus.atwebpages.com/39634875974.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/c_i_a_movie_ringtone.pdfIn PDF document text
    • http://puzexexaniledow.epizy.com/15134488275.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/belhaven_beach_surf_report.pdfIn PDF document text
    • http://bumupumelagel.epizy.com/89287362459.pdfIn PDF document text
    • http://jepojofugag.rf.gd/41692826788.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_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 5456 bytes
SHA-256: 21569cde3d7da4c8464f7f142472486bd02a726a6bc8d5a6602be89f9146e550
font_01_sfnt_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 10144 bytes
SHA-256: 4c90d52981fec7ebf325b6cfff5ab7b994048cd9aad98f19d19172cf74bb6438

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