Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cddc950b6b5901…

MALICIOUS

PDF

73.2 KB Created: 2021-02-21 01:46:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a421ead118e4b3a99907f34309a2cfe4 SHA-1: ca0ec5a99954ec92501ad82293392f38ec9415df SHA-256: 93cddc950b6b5901035d55899a527e407f366e9f84ada87e7b8d5101eb3695cb
262 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a large number of external PDF links, suggesting a link farm or phishing campaign. The presence of a 'download button' lure and instructions for a password-protected archive further support a phishing or malware delivery scenario. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=how+to+get+canon+ij+scan+utility In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413004/normal_601159a02c66e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470689/normal_60136be574267.pdfIn PDF document text
    • http://dvertsoff.ru/535229228974b80q.pdfIn PDF document text
    • http://noksipals.online/pabelupunuvavekobe0bj13.pdfIn PDF document text
    • https://vanimiravupu.weebly.com/uploads/1/3/2/7/132710567/ragazerareweduben.pdfIn PDF document text
    • https://nubiduxabegi.weebly.com/uploads/1/3/1/8/131871606/d238336c5.pdfIn PDF document text
    • http://creditchecktotal.info/88867453492osits.pdfIn PDF document text
    • https://ditezuni.weebly.com/uploads/1/3/5/3/135350757/zetemazenovatamen.pdfIn PDF document text
    • https://pitazifuriza.weebly.com/uploads/1/3/0/9/130969431/9864251.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://papitanado.rf.gd/kabirenuwubiz.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/walavafi.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/pubg_emulator_hack_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/81134674145.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/jitatijopujex.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/86870428189.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/blue_link_hyundai_app.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 4984 bytes
SHA-256: 8cdd2c5bbab658e7e0140b635bb4b2e892af42b685aa4a5ed6a31a49778cde75
font_01_sfnt_off0000e531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 11036 bytes
SHA-256: f37daa1307626cf42f4a663adc69fe93ee53d6470f1023f53e8b697dbd54e9ac
font_02_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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