Malicious PDF — malware analysis report

Static analysis result for SHA-256 7879846936766eb3…

MALICIOUS

PDF

75.6 KB Created: 2020-12-26 01:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4cd76e2c4a4794e736e1709bb1446cd1 SHA-1: b3b0e87b7ccc288eed8c1e04512d10701582e9a3 SHA-256: 7879846936766eb321437b2639ad78c0bbb99d05ad50e9696fe5baec6ed484d8
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with heuristics indicating a link farm and redirection to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains strings related to 'live wallpapers' and application metadata, suggesting a lure to disguise the malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/strik?utm_term=very+awesome+live+wallpapers+iphone In PDF document text
    • https://fepuvagugi.weebly.com/uploads/1/3/4/7/134767339/1232226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391047/normal_5fc901bc8b3b7.pdfIn PDF document text
    • https://xurafexejigaf.weebly.com/uploads/1/3/4/5/134588012/75144cd2571c.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/cXTKibe/henry_survival_rifle._22._410.pdfIn PDF document text
    • https://xefujalebide.weebly.com/uploads/1/3/2/6/132681694/serododunumiguk_tajunek_jumenujuvar.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/gasodamuza/awaiting_you_myths_and_hymns.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/runixesetubivewemupatil.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/nikobin.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/maths_riddles_ks3_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/introducing_applied_linguistics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dadf139b-e657-41bd-b5d6-b1d4dd678df6/death_of_a_salesman_biff_american_dream_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/8040865489.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_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 5280 bytes
SHA-256: 687072223a486fd24d889baaf89ec01af2472d2e49e7dab75329a19e9ae0319c
font_01_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 10732 bytes
SHA-256: 2eb38c51d1366b32d6eb70bddc726efe5a07d886cbdb96913ad34548ece7d2fe

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