Malicious PDF — malware analysis report

Static analysis result for SHA-256 a707e32ee20cbe79…

MALICIOUS

PDF

67.4 KB Created: 2021-01-14 11:58:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9784b1e10e67c0d64ac4b03b47d890c1 SHA-1: 9b29289344288070861c53173108ef8a97c5d1f3 SHA-256: a707e32ee20cbe79c3ccb529a1acde2e87bcfc4269cb13de784bfd692db3e0e8
214 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 external websites hosted on services like Weebly and sqhk.co, suggesting a link farm or redirection infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these URLs is known to lead to malicious content. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a lure to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=core+java+mcqs+pdf In PDF document text
    • https://reratedazakowim.weebly.com/uploads/1/3/1/3/131378897/5093349.pdfIn PDF document text
    • https://tenewalewufubin.weebly.com/uploads/1/3/5/3/135329800/jadewakumizit_mukunisedubo_raxad.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/gdssNgI/hill_country_road_trip_from_austin.pdfIn PDF document text
    • https://tugigoboz.weebly.com/uploads/1/3/4/4/134499705/zilibarapi-vemel-nigawizesolebip.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/radegom_wadurexija.pdfIn PDF document text
    • https://cdn.sqhk.co/vujixete/qPCia7c/sword_art_online_arcade_deep_explorer.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/dg8Ypih/bellator_mma_onslaught_ps3_download.pdfIn PDF document text
    • https://nixoferijoxe.weebly.com/uploads/1/3/4/3/134373865/3a84ff90df.pdfIn PDF document text
    • https://rilitovewub.weebly.com/uploads/1/3/4/0/134095842/pubejumujiwafosoxupa.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_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 5436 bytes
SHA-256: 74edc25e9787dde37a44a614d501c6741da18dab83bab7930853c3ee3bdafc2e
font_01_sfnt_off0000dbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD9 11116 bytes
SHA-256: e2da27b5f6ebb59283364087ef8c0c83f28ba3e41a40977678018083aab4982e

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