Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8283e7ea5a34a0c…

MALICIOUS

PDF

80.0 KB Created: 2021-02-18 00:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ebf2640c11860050fa29c9a7f7eed803 SHA-1: 265046a76943bfc68b26d8041b24dd739676ed4c SHA-256: c8283e7ea5a34a0cbca47fa2672bc0526df92ed8e0297e2c19bb75b1ee1452e7
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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/strik?utm_term=short+stories+in+english+audio+online In PDF document text
    • http://pushbiz.fun/63217827570kechg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_600cc59e8a2ba.pdfIn PDF document text
    • https://nigikejogu.weebly.com/uploads/1/3/4/9/134902550/7babde7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487187/normal_5fe3391392987.pdfIn PDF document text
    • http://unreguezff.rest/fidasadenepafuldzlw3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451945/normal_5fe69d43bc88b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483608/normal_6014575d11839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_601cbbe20e276.pdfIn PDF document text
    • http://funseeds.site/prefix_and_suffix_worksheets_for_grade_416wmi.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/drkjaNx/62204728443.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nafevozow.rf.gd/google_storyboard_app.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/jazikupovesisaselifozovu.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_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 5188 bytes
SHA-256: 03c1e8518c3d78a1fab376008993b6e3db696148386a8b2d7efcc1cd404af287
font_01_sfnt_off00010d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D88 10952 bytes
SHA-256: 4693c70e742ecd9470c5f113e21c2f225e0592b7aa08c8cf6fe96e886b200326

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