Malicious PDF — malware analysis report

Static analysis result for SHA-256 481b33080cf3832e…

MALICIOUS

PDF

87.8 KB Created: 2021-06-03 15:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d4e05193e8c4c6d2072a148f2e449fc0 SHA-1: de881dfd4cea9691b0b9bf24a2fdcf3df43080fe SHA-256: 481b33080cf3832ead66ba899f5b01d7d6a11df0e3dc5962a47e1f22d636988d
204 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous links and the heuristic firings suggest the document's primary purpose is to redirect users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=aryavarta+chronicles+epub+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415334/normal_6040348920e09.pdfIn PDF document text
    • https://kilekofizinovi.weebly.com/uploads/1/3/3/9/133997912/zanusanuwo.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4419827/normal_60afe405b61b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_606d5bf8379de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_602f2d09d766a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445555/normal_5febc90ce20c1.pdfIn PDF document text
    • https://muborite.weebly.com/uploads/1/3/4/4/134442605/9728d0028345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450036/normal_6052dcd658b45.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/9518558.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4379606/normal_60b750f004f71.pdfIn PDF document text
    • https://sidufuzijek.weebly.com/uploads/1/3/4/5/134598689/jojig_tozurixof_moxilidazona.pdfIn PDF document text
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/kivorufota-xodedexi-govomumose-ladoxaluzoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sovafiben.pbworks.com/w/file/fetch/144539646/75695777871.pdfIn PDF document text
    • http://sinorodolu.pbworks.com/f/gulokazifatowapobinu.pdfIn PDF document text
    • http://rozeluf.pbworks.com/w/file/fetch/144563124/19307856936.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/f/kali_linux_virtualbox_default_root_password.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/f/customer_visit_report_template_word.pdfIn PDF document text
    • http://podimil.pbworks.com/f/ninjago_masters_of_spinjitzu_season_10_episode_95.pdfIn PDF document text
    • http://kufogokoges.pbworks.com/w/file/fetch/144434535/41462295159.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/what_is_the_seat_of_the_soul.pdfIn PDF document text
    • http://fixiguru.pbworks.com/f/55394597523.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/45837877842.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_off00011a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A62 5392 bytes
SHA-256: ae9a8cf2598e80abb65ed3eb1bb7ab7b370c00f8d6b8d6f9f64aa543822d997a
font_01_sfnt_off00012cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC0 10356 bytes
SHA-256: ae48fdbb7f8b16991dfbdcac02e9c8c31a2e90db49a04a8835ee25a1f71199a6