Malicious PDF — malware analysis report

Static analysis result for SHA-256 04bbab5f1db80c19…

MALICIOUS

PDF

74.2 KB Created: 2021-02-15 14:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ae3e66ca4ba52ca1587beea178604c71 SHA-1: d37bd8a76cbc2db7d8573fa6a9b268325852b750 SHA-256: 04bbab5f1db80c191d6aa8b10fd0d174429e5efea8d0ed991967e0ba8a4e78a9
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik'. This URL is likely used to lure users to a malicious site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL in a PDF document is a strong indicator of a phishing or malware delivery attempt.

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/strik?utm_term=redmi+note+4+release+date+in+india In PDF document text
    • https://naxaletuzo.weebly.com/uploads/1/3/4/5/134508506/4463423.pdfIn PDF document text
    • https://fanarise.weebly.com/uploads/1/3/4/3/134377412/fifozaxi.pdfIn PDF document text
    • http://metalllift.ru/vekegipifupyoj4.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/lavafoketin.pdfIn PDF document text
    • http://tularobumof.66ghz.com/lebamegubukubitan.pdfIn PDF document text
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/9896312.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/5655167.pdfIn PDF document text
    • https://kumumejetosen.weebly.com/uploads/1/3/0/9/130969188/vizefogoral_fumakajubag.pdfIn PDF document text
    • http://paximosikelos.22web.org/dafilevipiwu.pdfIn PDF document text
    • https://winenexosipagep.weebly.com/uploads/1/3/2/8/132814343/2314011.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/bisiku/67481696549.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/cambrian_period_ep_2_eng_sub.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/tisorenunujeku.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/29732121224.pdfIn PDF document text
    • http://zulonojaminipe.rf.gd/jedafavosubelumaw.pdfIn PDF document text
    • http://buwanizun.epizy.com/government_spending_trim_that_budget_answer_key.pdfIn PDF document text
    • http://rixavadalut.rf.gd/facebook_lite_apk_and_install.pdfIn PDF document text
    • http://gusegata.epizy.com/debuzijuture.pdfIn PDF document text
    • http://susupufewowe.epizy.com/walogusan.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_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 5064 bytes
SHA-256: cc87255079a32941d61d936170bfdda2689a0cef8a8d9f20d2be198fb9a9c587
font_01_sfnt_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 10812 bytes
SHA-256: ca9c16b282b4d037e27e653dd1236778fd73e161d9eae6fd87dfd507bd7952ca

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