Malicious PDF — malware analysis report

Static analysis result for SHA-256 7476aa51a9d3074a…

MALICIOUS

PDF

82.3 KB Created: 2021-02-13 00:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6dbf8b6883dda6e7061366efb06932cd SHA-1: 39bc16499cd929697879adce922f1b3ce6a66af3 SHA-256: 7476aa51a9d3074a33bd8e4e41aefc827eb5551236979d516a14b62157e11246
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and numerous external URLs strongly suggest an attempt to redirect users to malicious or spam content, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=mhw+canteen+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404753/normal_5ff60e77dcd84.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/ijTjchc/word_crush_level_75_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/verikiweneza/jjiUhiB/smashing_glass_spiritual_meaning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5ffd1104a6c94.pdfIn PDF document text
    • http://shoop-fe.ru/294643485907av3g.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/ixCAKXY/monudolikejazipafefawuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384167/normal_5ff22392568c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491450/normal_6002d2af20d35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414159/normal_5fe43458c6295.pdfIn PDF document text
    • http://lovelid.xyz/21116046253ecv0a.pdfIn PDF document text
    • https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/544630f5f2d5d.pdfIn PDF document text
    • https://sedemosifov.weebly.com/uploads/1/3/0/8/130874126/kemodepe_ronugoloderokiz_novabixu.pdfIn PDF document text
    • https://tosoremekik.weebly.com/uploads/1/3/4/7/134771766/8e8b0fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 4992 bytes
SHA-256: 5853edd06fb2e2fb165893cea22f6f6406e72356b4e544adcc657a10b3d8994c
font_01_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 10184 bytes
SHA-256: 2e22e74e206b81c5a7c30428e1b3102d4fafb5d71c006a2b562fd319410eed3d
font_02_sfnt_off00012724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12724 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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