Malicious PDF — malware analysis report

Static analysis result for SHA-256 16db16a348a1a753…

MALICIOUS

PDF

73.6 KB Created: 2021-02-27 03:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0fbdf29350fb97ed132b4e71bbf7c7a4 SHA-1: 1861640f9d03b27c5712c78b0599c85950e699d3 SHA-256: 16db16a348a1a7539f9951b04d6b9ce87d81d372595dd33dedc4db7c46116b8f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm designed to distribute other malicious PDFs. The primary URL, 'https://golowaki.ru/wix?keyword=charles+darwin+worksheets+activities', appears to be a lure, redirecting users to potentially malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/wix?keyword=charles+darwin+worksheets+activities PDF link annotation
    • http://tixesikixux.mygamesonline.org/mopusudijo.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/ryobi_bs900_band_saw_parts.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/the_sword_of_summer_google_books.pdfIn PDF document text
    • http://dorightpress.com/nalotavezigisexijadogazjf1ur.pdfIn PDF document text
    • https://polerobozugewif.weebly.com/uploads/1/3/4/3/134344868/fumitozuvumorux.pdfIn PDF document text
    • https://zosojelukik.weebly.com/uploads/1/3/1/8/131871698/kuwomuvijur.pdfIn PDF document text
    • http://malipawiw.22web.org/blackjack_card_counting_spreadsheet.pdfIn PDF document text
    • http://futupuj.22web.org/how_to_day_trade_successfully.pdfIn PDF document text
    • http://ralugugifoxatir.scienceontheweb.net/84834983871.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/bharatanatyam_mudras_double_hand.pdfIn PDF document text
    • http://fekider.epizy.com/75450254083.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/faguzepuguxafiluxakimorud.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/google_drive_docs_sheets_slides.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/cadd_prizm_pump_instructions_video.pdfIn PDF document text
    • http://vaterojot.epizy.com/arduino_uno_ethernet_shield_tutorial.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/sukegajasogi.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_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 5148 bytes
SHA-256: 1fc21117cc699bc015526206a860e1af71229e6ecc493677de7e2fbbe1da951d
font_01_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 10240 bytes
SHA-256: c552ba9cb8dff5435575978c900ef853f22076322217acc494f0c6384d162422

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