Malicious PDF — malware analysis report

Static analysis result for SHA-256 9626fc8d3e9503aa…

MALICIOUS

PDF

82.9 KB Created: 2021-02-23 08:11:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 181a24fc89f5df2278e19d481eebe2fe SHA-1: fa242e93e197707d7a9fc51933dd48c5c124ab8b SHA-256: 9626fc8d3e9503aa7d6a6e778fa411c77c94b1834c54e8bbb80d34b23d24324b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDFs hosted on various disposable domains, a technique often used for SEO manipulation or to distribute malware. Heuristics indicate these links are part of a link farm, with some pointing to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/aws?utm_term=what+is+a+demand+letter+in+real+estate In PDF document text
    • https://rominekajamarol.weebly.com/uploads/1/3/4/0/134040464/9394a06.pdfIn PDF document text
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/3a5158.pdfIn PDF document text
    • https://lagubezawepafu.weebly.com/uploads/1/3/1/8/131856446/gusanezetogid.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/gDx92oQ/dream_girlfriend_mod_apk_unlimited_everything.pdfIn PDF document text
    • https://surigogalabilix.weebly.com/uploads/1/3/5/9/135961506/jukoxolowiki-xuxedinaz-lamaxitogulel.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/JP6jfji/kajiw.pdfIn PDF document text
    • https://sefatepasegul.weebly.com/uploads/1/3/0/7/130775173/1911084.pdfIn PDF document text
    • https://gepadera.weebly.com/uploads/1/3/0/7/130740344/4f3c8add1.pdfIn PDF document text
    • https://damozudi.weebly.com/uploads/1/3/0/7/130776403/7970066.pdfIn PDF document text
    • https://sisuveraxom.weebly.com/uploads/1/3/2/7/132740665/nazebujiko_xusurutu_zisiw_gages.pdfIn PDF document text
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/kegup.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/ilhh3Is/42094571279.pdfIn PDF document text
    • http://vesibigezedenu.iblogger.org/oxidative_phosphorylation_packet_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwegamuvev/hadijjd/16178686913.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/49689912796xzmbq.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/highgee/cancel_hallmark_channel_on_amazon_prime.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/ruger_lcp_2_.22_reviewsd7doy.pdfIn PDF document text
    • http://zokumujanuni.iblogger.org/individual_sports_fight_list_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10819 5076 bytes
SHA-256: 2bb144c85fb9cbb92a122c7fd991bb6a52ed7dc8c828bb66b7fcc6520d2df737
font_01_sfnt_off00011938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11938 10852 bytes
SHA-256: 4210a513e188c28cb0ec937bad9142b3c362195248bbc7044962a572af789dd5

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