Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f42fb22b3d8be0a…

MALICIOUS

PDF

73.7 KB Created: 2020-11-26 08:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c2f33a72289d9916b77bb087ca9dfcda SHA-1: 0e104fa6353fb054989aafac9a877ad2f43c3e65 SHA-256: 7f42fb22b3d8be0a52379b54e771e7990212d10cce40bd90ec5ba76fd349999e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The file contains a large number of embedded links, suggesting a link farm or SEO manipulation tactic. While no scripts were extracted, the PDF structure and embedded links indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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/strik?utm_term=five+step+lesson+plan+in+urdu In PDF document text
    • https://cdn-cms.f-static.net/uploads/4475212/normal_5fa769b64ad86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_5f8ff62a52b74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_5f89ec092c867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386829/normal_5fa146dcad49e.pdfIn PDF document text
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/e2c24ea54eee5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414176/normal_5fa6081c27831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5f96e1e8d2c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_5f94cef6c6ff0.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
    • https://s3.amazonaws.com/sowewazulejewi/a_koopa_revenge_2_unblocked_77.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_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 4852 bytes
SHA-256: ce80023a321d763e22e60d35549fca6c9766ce43512c87b55f99dc5926e8ddac
font_01_sfnt_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 10440 bytes
SHA-256: 1bc9507c58c31aecccfd0b30f1c2fa959924a351347550c1961085630f3510dc
font_02_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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