Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea29caa2fd08008…

MALICIOUS

PDF

75.5 KB Created: 2021-02-15 21:03:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 323220def673c82678872054f8637c98 SHA-1: b7ba8eb647c903edb0855236e85472824ae77fbf SHA-256: 4ea29caa2fd08008f67a4079aa26332a19baebded7cd05d392ae7318ae40fe06
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious redirector, specifically designed for phishing lures. It links to known malicious infrastructure, suggesting an attempt to trick users into downloading further malware or visiting phishing sites. The ML classifier and ClamAV detection strongly support its malicious nature.

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 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 lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=mr+coffee+iced+tea+maker+tutorial In PDF document text
    • https://cdn.sqhk.co/zowesifona/hisiihf/dollar_origami_dragonfly_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/kiviziko/brjhia6/screen_recorder_and_audio_recorder_for_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabumamuv/jcZJihr/talking_dog_funniest_video.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/nohdRid/pudirawasopowuziwamusove.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/ihiwgjn/xirepuvewexanametis.pdfIn PDF document text
    • http://copyright-securityx.com/5939921053868j67.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/jibRgi7/xuxibo.pdfIn PDF document text
    • http://realwockyc.info/bepilubodilejaddpyl9.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/roKhem4/rixigikukeziwolaxibozo.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/T8K8Ygi/55586048871.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/nefagolom/bittencourt_penal_1.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/computer_science_board_paper_2018_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/kubuwewexonabisuwafo.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/employment_history_report_irs.pdfIn PDF document text
    • http://fedaposadado.rf.gd/38380240811.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/midikakixewusulub.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/antivirus_terbaik_android_xiaomi.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/5212228873.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/44187721308.pdfIn PDF document text
    • http://pamuxizuj.epizy.com/circular_motion_worksheet_tahoma_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/1895869777.pdfIn PDF document text
    • http://bomepexajusopa.epizy.com/punuj.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_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 5060 bytes
SHA-256: 7af7d410f1d32befe3e5a150cd1299f7f20017fea67e21bba4d8ee81804691bc
font_01_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 10580 bytes
SHA-256: e39aa82459f61af355539ca74bb035050957af70f6626d486303617379ed8f35

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