Malicious PDF — malware analysis report

Static analysis result for SHA-256 daab77c7aa171ad8…

MALICIOUS

PDF

66.0 KB Created: 2020-12-22 05:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f9b203acfe0399e31a9981ca7b8b74f8 SHA-1: 7e8ef1363707a5075db0fb37e1c9e0991b245f07 SHA-256: daab77c7aa171ad88030f3c1c356827a349265998c400b59b48694a928a1f6c7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a mass external link farm, with multiple URLs pointing to Weebly and other hosting services, suggesting a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no explicit script was found, the PDF structure and embedded URIs are indicative of malicious activity designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://trafffe.ru/strik?utm_term=super+penguin+run PDF link annotation
    • https://xosifuto.weebly.com/uploads/1/3/4/8/134891486/5c1479aa88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462986/normal_5fdf533cae45f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5fcdb25bb78a0.pdfIn PDF document text
    • https://zusadadej.weebly.com/uploads/1/3/4/8/134856209/fijiro-zigorito-ripodatuzir-dogamifej.pdfIn PDF document text
    • https://lotetirupaxep.weebly.com/uploads/1/3/4/0/134013035/2018585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_5fbb6e9bd2648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454803/normal_5fbb5a057b880.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/xanebavifamopez/42738799786.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/manorama_calendar_2018_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/1121933529.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/telugu_movies_2018_free_sites.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA801 4668 bytes
SHA-256: 0c3667306aeb934d3ca2751d195d3dce191bd94d739d8fe199cd6f5a590f8d73
font_01_sfnt_off0000b7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F0 2372 bytes
SHA-256: e7f99a801a83e9e338436850d034a5ec2cd41ae778e28f7c79ed4b80d179693f
font_02_sfnt_off0000c25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25B 9712 bytes
SHA-256: ba510fe85d7db6337bb7186758a957ce583b08872e885cd4643a086e89cdd019
font_03_sfnt_off0000e2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 16676 bytes
SHA-256: 8b7c10c900d8eec8745ce1d64b2df27c7a07f8388155479591d767647349b795

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