Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f8c244123ba8ce…

MALICIOUS

PDF

73.8 KB Created: 2021-02-25 02:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1fff67a6d4db3881b950c3cc79708d06 SHA-1: be9c0e009559802aaa268e88a8c0a1e59507ad45 SHA-256: 05f8c244123ba8ce0313512b65aa509788ee808643481f51186e5e3d602045ef
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are flagged as malicious or part of a link farm. The primary malicious URL, 'https://crophysi.ru/strik?utm_term=reset+oil+change+light+2010+toyota+prius', suggests a phishing attempt disguised as a search result. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://crophysi.ru/strik?utm_term=reset+oil+change+light+2010+toyota+prius In PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5ffd242d1214c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448551/normal_6035d26109bc5.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/5346417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387929/normal_60168194f3e17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_602c3959b8a8e.pdfIn PDF document text
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/4529087.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/fapaga/mobipogafatavoletiwata.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/45829191558.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/vujirixedakuvuwanepawole.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/wiberofomokuvur.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/38256557734.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/breathe_on_us_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/57035547421.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/74783666566.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_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 5632 bytes
SHA-256: c37725c1527470e1ef486d043b6832246a62248a8a4b2aed38c926e8cf2fe9fc
font_01_sfnt_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 10148 bytes
SHA-256: b882736417f2bf15c0748c43a245c6245decc78bbaed491e99543bcb4f1b7aed

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