Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3527116c53827f…

MALICIOUS

PDF

74.8 KB Created: 2021-06-01 07:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 46bdb310960eceeba4f3f2fbd9a8f470 SHA-1: b0b6e759230506dbf23574de0e9ef58f4eb54615 SHA-256: db3527116c53827fccf0e09e564d66c96c82f6051efc7528fcf53196524af30f
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, and is detected by ClamAV as Pdf.Phishing.Trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful websites.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://catamma.ru/pbw?utm_term=amsterdam+metro+map+pdf+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446776/normal_5fdc188668ff4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379240/normal_5fe0b95e4a96c.pdfIn PDF document text
    • https://sajolunuweto.weebly.com/uploads/1/3/1/4/131407571/ab1f900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426549/normal_5fe0f8c82a867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_601861b3e5279.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425255/normal_60086ad1944db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_6019518ad66f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_600eb15d8dbcd.pdfIn PDF document text
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/6458082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495973/normal_5fd674d04f827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412161/normal_603b05215d2d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_5fe8f134d145d.pdfIn PDF document text
    • https://fisenekapiwu.weebly.com/uploads/1/3/1/4/131437930/rawekumafa-zefaxaxir-bugaditumib-jubev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443802/normal_606ea709845b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407983/normal_5fdd43607d8cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_60395bb7c9a72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5fce910a6396b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_602d8d195613e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sewafebi.pbworks.com/w/file/fetch/144426570/fnaf_the_fourth_closet_free_download.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/87849754443.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/w/file/fetch/144426117/14097614846.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_off0000e768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE768 5444 bytes
SHA-256: 210554616f3e21ec2b959d95bd8ec8758f00e74be8f9a1f3a6afa505b516afe4
font_01_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 10832 bytes
SHA-256: 4ba7c424ea564625fbffa7ac80159e845c8b88466e8477ff1494c98c056dba26

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