Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef11fa53affa0f1…

MALICIOUS

PDF

69.4 KB Created: 2021-02-18 12:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 04cb7c4c51ea02bcd84ec4c6fc42ee75 SHA-1: 70a95f97a3b6bc1967e70e8c154f1e9790634f53 SHA-256: 1ef11fa53affa0f124b8fe52991ed2c2f3ffafa6c416fb2e3cae7cd2a408f220
224 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including critical detections for malicious redirector links and a general ML classification of maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The numerous embedded URLs point to suspicious and disposable domains, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://yafferge.ru/123?utm_term=husqvarna+weed+eater+pull+cord+not+catching In PDF document text
    • http://itclick.pro/xamarin_forms_android_splash_screen_image_sizeumhyw.pdfIn PDF document text
    • https://malugeko.weebly.com/uploads/1/3/1/6/131636988/revubozugeno-bubeduluvij-jenerowojuget.pdfIn PDF document text
    • http://sukujemegamog.22web.org/jilunuvitiso.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/hajiE5x/telegram_desktop_call_no_sound.pdfIn PDF document text
    • http://sodahub.pro/angels_and_demons_book_vs_moviernoo2.pdfIn PDF document text
    • https://gemaxapofa.weebly.com/uploads/1/3/2/6/132681544/1542818.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/iajayjh/party_puffle_stamp_club_penguin_rewritten.pdfIn PDF document text
    • http://com-login8.xyz/lojidiforud5st9.pdfIn PDF document text
    • http://serdyukov.pro/kekoxuwqzg.pdfIn PDF document text
    • http://x-bionic.shop/razawetapizab8049v.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidaxiwuk/Shejfgg/87579641458.pdfIn PDF document text
    • http://badgesverified.com/free_printable_coloring_sheets_pokemonmv7rt.pdfIn PDF document text
    • http://segway-wheelchair.ru/918434509712182x.pdfIn PDF document text
    • http://domensita.fun/non_conformance_report_adalah9eumq.pdfIn PDF document text
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/gumiloluvini.pdfIn PDF document text
    • http://logoped-samara.ru/xezupisah8prv.pdfIn PDF document text
    • http://marafonsport.site/81622118576ukbpi.pdfIn PDF document text
    • http://unreguezff.rest/determining_the_limiting_reactant_lab_answers8o0tu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lifenasixo.epizy.com/62924647977.pdfIn PDF document text
    • http://tamazodatitemi.epizy.com/arinc_429.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_off0000d196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD196 5576 bytes
SHA-256: 65bc26dcf8814ffb4db0b3ad1e4e5233bcbc14e0f63941bcdeb5afbe22e72d70
font_01_sfnt_off0000e498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 10388 bytes
SHA-256: d309f9de37d79816265221cfa8e00a5e6c8b0995cac5783d82dd8eaec445dc59

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