Malicious PDF — malware analysis report

Static analysis result for SHA-256 e640de5c914077ad…

MALICIOUS

PDF

64.1 KB Created: 2021-02-16 16:31:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fce0485e92c27b5c6e28bf8f6350254e SHA-1: 11a486d946166e59478d1c391c95eedcb08b5540 SHA-256: e640de5c914077adc04623f35008cd19b647bd356a3394a91ee79bad4901e36a
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links to external PDF files, indicating a link farm strategy. One of these links points to a known malicious redirector, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

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 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.
  • 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/wb?keyword=timex%20indiglo%20wr%2030m%20price%20philippines In PDF document text
    • https://goxanakevixi.weebly.com/uploads/1/3/4/8/134857001/25f62e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369496/normal_60027c4f3f2fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477916/normal_5fd34d5b245a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_601e96e9ebc7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505699/normal_5ff666b644581.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/tomamujuf/jeevansathi_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/arbroath_academy_uniform.pdfIn PDF document text
    • http://gesonumakokobal.rf.gd/40184425517.pdfIn PDF document text
    • http://tudigefogoxawu.rf.gd/18753073471.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/nodijodilavolopufip.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/family_medicine_clerkship_guide.pdfIn PDF document text
    • http://kosidigipetuvu.epizy.com/zaganimona.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/61445917259.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_off0000bbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC7 5692 bytes
SHA-256: 4438bd4bf071c28ebcf07f69dde67b60880384ae24ebf7bf62a590d624819b54
font_01_sfnt_off0000cf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF16 10272 bytes
SHA-256: a96bd4b274a81d4a231310c714172203b97f4282ae02f4b3140289e863775241

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