Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c60701ddb44d22…

MALICIOUS

PDF

79.1 KB Created: 2020-11-25 08:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1007c65a2058cb1312080633976359fe SHA-1: 910c73eb79f817ece665b72975a5a2103180e97b SHA-256: 33c60701ddb44d22217d4da8e9cb863a220bbfc1903159fcd5b41351565c2982
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The heuristic firings indicate it's a malicious redirector and a link farm designed to distribute content, likely phishing pages or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/strik?utm_term=moving+forward+with+literature+circles+pdf In PDF document text
    • https://mijelowiwiloz.weebly.com/uploads/1/3/1/1/131163856/zaberimov.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/nijulavoniret.pdfIn PDF document text
    • https://nurekagenarufab.weebly.com/uploads/1/3/1/6/131636906/7f5f9ec1d01f.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/6883937.pdfIn PDF document text
    • https://kuburabet.weebly.com/uploads/1/3/4/3/134362545/50282f08646503.pdfIn PDF document text
    • https://zovaxisudu.weebly.com/uploads/1/3/4/7/134729802/2a58134f3e8bc48.pdfIn PDF document text
    • https://penarira.weebly.com/uploads/1/3/4/7/134742142/dufugajunopigafedij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd14ddd-f0b6-4c5e-80cc-602b3b3dd210/tisexeribejirogasogoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a123765b-5939-439b-bca0-d09ad0b45c1b/28899244713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6daeff80-4414-44e9-a6c7-7340a9586655/lanamipoperujuvoped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca764a8-06a3-444d-a599-a5bf9c140cbc/defawufumiwitemeguxu.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/scarborough_high_school_twitter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd9bbc18-427f-4819-9054-c9db1e87c00c/side_lengths_of_a_30_60_90_triangle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86478a09-d0b7-48f5-919b-08dd1258a552/60708020257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e339c9c-5e95-46d0-821e-82457d82279d/xegugipibite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57af933-62d7-4943-b85f-7fc1ed4ed7fd/32193009435.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/derek_prince_francais.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_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 5576 bytes
SHA-256: 26fa0647dd84fb2b929b4df75b0f57e72d3189ab74460d99ae507a9d2179b3b3
font_01_sfnt_off000109d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 11028 bytes
SHA-256: eefe5bd06f2fd820810d1dc3510670af4e907ce9336b4a7a260dee6e0baac4f8