Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa9eb95be81e140…

MALICIOUS

PDF

71.5 KB Created: 2021-04-02 13:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc4f934bf113abc5ffd3b88489ef82a2 SHA-1: 741e17dd0308439ea5df85f1df709eb4042f6b70 SHA-256: 8fa9eb95be81e14089ef510db2b3e86f6fa6836aa79df1e2d9df4b701cdf7781
136 Risk Score

Malware Insights

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

The PDF contains an embedded link to a suspicious domain, which is flagged by heuristics as a random URL. ClamAV also detected the file as Pdf.Phishing.Trojan. The presence of an external URI and the ML classifier's high confidence score indicate a phishing attempt designed to trick the user into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/123?utm_term=cd+template+design
    • http://lisolu.org/what_is_scapy-python3rnqp2.pdf
    • http://teksalle.xyz/majulowemazasusegp780.pdf
    • http://privateguardingserviceagainstdanger.site/952444669188dz39.pdf
    • http://reduslimitalia-ufficiale.site/xeduxekavipuketawar9vzc.pdf
    • http://italywow.info/9746532598z30uo.pdf
    • http://fruitslope.online/what_if_pangea_still_existed_redditb5xbb.pdf
    • http://complerbnp.com/nogil621su.pdf
    • http://slmit.fun/tepiriruzinudh5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xomudufe/48994598758.pdf
    • http://sedijinuv.epizy.com/campylobacter_food_poisoning.pdf
    • https://s3.amazonaws.com/pevarijidasalop/fuviriguponugu.pdf
    • https://s3.amazonaws.com/povodijirig/pujeguw.pdf
    • https://s3.amazonaws.com/lopadivupudexa/2017_nissan_armada_maintenance_manual.pdf
    • https://uploads.strikinglycdn.com/files/87b79c30-a6f4-4e91-bf64-da6517103b74/i_am_that_guy.pdf
    • https://s3.amazonaws.com/wexukufedepim/42786668579.pdf
    • https://uploads.strikinglycdn.com/files/91030b19-a274-4421-bddb-52b08ebfe768/why_did_my_car_ac_suddenly_stop_working.pdf
    • http://nesenavepino.epizy.com/ninuw.pdf
    • https://s3.amazonaws.com/vudivuzakal/misirefabojonajaxo.pdf
    • https://uploads.strikinglycdn.com/files/f2182edf-ae60-4332-8e99-3d10edf2cd1c/music_for_sight_singing_espaol.pdf
    • https://uploads.strikinglycdn.com/files/91e2d64f-0f9c-412c-9e4f-fe9b06f607c1/dobuxuz.pdf
    • https://s3.amazonaws.com/zepifudoxapo/classifying_and_balancing_chemical_reactions_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/3b370daa-ff0d-4528-9beb-dc9514769344/dark_sun_shattered_lands.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_off0000dbf7.bin
9063cd2e3cd90982c07a5a798edc189cf41937fad792d2535a344aa234cc662d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 5088 bytes
font_01_sfnt_off0000ed2e.bin
c615e5cb4d86a611bf707acfa9d31b2d910e44765224b93277ae5b762075dcfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 10540 bytes

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