Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4e268320b9aa69…

MALICIOUS

PDF

72.6 KB Created: 2021-02-25 20:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d2df5e7c5dcb9db3dac01804cc74119b SHA-1: 86910e33b07dc11691228012012d0a1c4d8a6283 SHA-256: 9a4e268320b9aa69dd2fb713dcbe63a4e90964535830e98a8ec960b6e2b3500c
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, disguised as a tattoo appointment booking system. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though obfuscated, suggests a lure related to booking systems, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=tattoo+appointment+booking+system In PDF document text
    • http://dujojiwasemob.mywebcommunity.org/the_tyrants_tomb_read_online_books_cool.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/funlux_camera_app_not_working.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/14770241738.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/UoJhgcP/puzukipunad.pdfIn PDF document text
    • https://niniteju.weebly.com/uploads/1/3/0/8/130814631/5883066.pdfIn PDF document text
    • https://cdn.sqhk.co/dakubakasilu/mYbhjjg/asteroids_galaxy_tour_vinyl.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/how_to_change_google_maps_fastest_route.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/vujitibijezudigosuderi.pdfIn PDF document text
    • http://moneyindia.site/graphic_design_brochure_templates_psd8yaog.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/nowadizifafiritife.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/jbggwzI/halloween_costumes_for_adults_near_me.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/dekogamik/detatebobududebulu.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/kusuneni.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/what_does_an_ankle_bracelet_mean_on_a_man.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/xonakivojasijib.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/bodedibusiseme.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/faxulusekodoxej.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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 5268 bytes
SHA-256: c37a1382c47395379871594d0f363548dd83e2424cc0a2a67db3ddcdcc0a6044
font_01_sfnt_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 12056 bytes
SHA-256: 1ab7545f0496eaf4b686e00831cd5185623cd696b2c037b531a29d9410ce87fc

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