Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf0556b792a885b…

MALICIOUS

PDF

70.4 KB Created: 2021-02-07 12:09:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 9f81e4f997811dba8cd05c54762cff71 SHA-1: eb3256b4b68b7ed8355b0a345c7c16dba7d8ba0d SHA-256: 5cf0556b792a885bed2caf93bf8b845e3061d755d2134eb5b29af50291f57b83
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf. The numerous embedded URLs point to disposable domains, indicating a likely phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's output strongly suggest malicious intent.

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 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/wb?keyword=o%20politico%20honesto%202 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4390057/normal_5fcc17e51a5bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419629/normal_601aa85c35cfb.pdfIn PDF document text
    • https://fofezuse.weebly.com/uploads/1/3/0/7/130739341/gadafakulo.pdfIn PDF document text
    • http://bighome.space/streamelements_alerts_not_working28111.pdfIn PDF document text
    • http://milansit.space/moana_soundtrack_mp3_download5si2i.pdfIn PDF document text
    • https://nugenezeni.weebly.com/uploads/1/3/4/6/134632238/semowolazeriju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409103/normal_5ff40d9acc947.pdfIn PDF document text
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/duwupok.pdfIn PDF document text
    • https://pogosarixuxa.weebly.com/uploads/1/3/0/7/130776079/xinagaxuzefexi.pdfIn PDF document text
    • https://seniwotod.weebly.com/uploads/1/3/5/3/135346371/3f6e4bfc5068de.pdfIn PDF document text
    • https://zosifoke.weebly.com/uploads/1/3/0/8/130813504/2619202.pdfIn PDF document text
    • http://youralteragoods.com/83frw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379744/normal_5fcfaacdda67f.pdfIn PDF document text
    • http://romeita.space/livofunalupineyq5l.pdfIn PDF document text
    • https://xokekomoto.weebly.com/uploads/1/3/4/5/134598663/00b40.pdfIn PDF document text
    • http://physcoo.com/19484644096ekdin.pdfIn PDF document text
    • https://gugivubur.weebly.com/uploads/1/3/4/3/134390132/xigegapeg.pdfIn PDF document text
    • https://xizirasifeda.weebly.com/uploads/1/3/4/3/134344010/bfba8494.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_off0000d44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44C 4876 bytes
SHA-256: f8283bc639885386b49dd35073f6df2e434187bcc92a11e1209fd94d9e3f7f6b
font_01_sfnt_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 12896 bytes
SHA-256: e7ebe8580edaf0f0f94d9485af7dbccc3566c2ac868057c1cdc1bd7b19b85b51

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