Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fc0014579770d1…

MALICIOUS

PDF

67.9 KB Created: 2020-11-25 15:32:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9666e2b9ccab170d57cc3db5ab4748ce SHA-1: d5f900c6b24daba59f04ccfde388b18c8b6a53c3 SHA-256: 83fc0014579770d19605bade4e90dbe232e401bcdeb7e004c052c5220ffb4495
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content, suggesting its primary purpose is to host these malicious links.

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://ggtraff.ru/aws?utm_term=every+which+way+but+loose+movie In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_5fbe1d37ef879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_5fb474b8ef9e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385635/normal_5f944c301340a.pdfIn PDF document text
    • https://lafumunokude.weebly.com/uploads/1/3/4/6/134666321/lujodax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_5fb997cac3b61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_5fbc8065749d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393911/normal_5f97c7af6edf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487191/normal_5fa9c5854d72e.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/pexodugosa/81187864479.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/gokexifuvesadagusebor.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/46032499531.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/comcast_motorola_dvr_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/peppered_moths.weebly_answer_key_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8199de9a-86df-4ba9-8ce9-975fa8c3e52f/gazerovepafijowujiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/750fb007-a45a-4c35-ba0d-2cf37edd2225/19804455926.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/24306137873.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_off0000ccfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFA 5388 bytes
SHA-256: 2403e9f3ee58058cb24adb25481393b56e5b55951b33058941558e948a9bea38
font_01_sfnt_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 10392 bytes
SHA-256: 75d02170de44d44ef98d4684cf7db0693dee979e9a377a67df62e53c093c809c

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