Malicious PDF — malware analysis report

Static analysis result for SHA-256 629d01b4ad79d082…

MALICIOUS

PDF

79.2 KB Created: 2021-02-17 21:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8d764ec67ec39a3e83d35319b9a7940f SHA-1: c6d51295a13f91b7a18b543f3e26d6ae64b3196a SHA-256: 629d01b4ad79d082af2c96a06112fc53bf7d99a9c39873263672a932896f11e2
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors, suggesting a link farm or phishing campaign. The heuristic firings indicate the PDF is designed to redirect users to malicious infrastructure. Although no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest malicious intent.

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/123?utm_term=how+to+breathe+during+a+workout In PDF document text
    • https://wilegefozuf.weebly.com/uploads/1/3/4/3/134399327/gurexowib-noluzuxore.pdfIn PDF document text
    • https://wuruderow.weebly.com/uploads/1/3/5/3/135389815/vonukoxog_vopobotemuruv_vusowimu.pdfIn PDF document text
    • http://jofufuzutaki.22web.org/kefodurozasiparidagupu.pdfIn PDF document text
    • https://cdn.sqhk.co/visobipibe/1ggnwig/speedometer_tracker_app.pdfIn PDF document text
    • https://jupoxoguji.weebly.com/uploads/1/3/4/0/134097256/puvitixaxaxuvo_salejudumajas.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/gjxhebU/twitter_logo_font_generator.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/vaxem.pdfIn PDF document text
    • https://kafememum.weebly.com/uploads/1/3/4/6/134616831/nizukileni-zureguwu.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/W2gigeZ/gesawizasilopojun.pdfIn PDF document text
    • https://dizufarul.weebly.com/uploads/1/3/1/3/131379939/d1c0ab.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/f7bd1e0cc03c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464311/normal_5fd698b8828ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://surofavuvaxono.epizy.com/49525839026.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/massage_gift_certificate_template_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/gosokixudorat.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/blackpink_japan_debut_showcase_full.pdfIn PDF document text
    • http://rodijegowufewap.epizy.com/26939183250.pdfIn PDF document text
    • http://rarezutawuwelam.epizy.com/faniribezoferubavepu.pdfIn PDF document text
    • http://kalogoraretupo.epizy.com/building_pathology_report_example.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_off0000fac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 5136 bytes
SHA-256: f179dcfa36cc36782035534fc6845f48689e6f9d993899e61f65bbae349263ae
font_01_sfnt_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 10300 bytes
SHA-256: f0a8d7f31b4cfdcdd1d135b7c132d2c2a8ebadfc776bfc65938b6b69f4aae1d5

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