Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc645057090cc056…

MALICIOUS

PDF

83.7 KB Created: 2021-02-15 18:33:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2e8bc8ad2ae3bc1c9567dfd69ef3d546 SHA-1: a886b1fc0e55d71564ccf7cd223d0cea1fd6610b SHA-256: cc645057090cc056a1c8383e99cd53d99bdeb05bcb62302ab8264cab22a2008d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm designed to attract traffic. The primary URL, 'https://jottigo.ru/strik?utm_term=fundamentals+of+heat+and+mass+transfer+7th+edition+incropera+solutions+manual', appears to be a lure for users searching for academic materials. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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
  • 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://jottigo.ru/strik?utm_term=fundamentals+of+heat+and+mass+transfer+7th+edition+incropera+solutions+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385028/normal_6012c969bd84f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366029/normal_600049de213c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462059/normal_6004093345e36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5fcf943bdef3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461204/normal_5ff96637e2daf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460688/normal_6020d392d7453.pdfIn PDF document text
    • https://rigawegafo.weebly.com/uploads/1/3/4/5/134587157/bugigulovasirop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380214/normal_5fefe76c6dc67.pdfIn PDF document text
    • https://supipujijasof.weebly.com/uploads/1/3/0/7/130739476/5963781.pdfIn PDF document text
    • http://storeplus.info/cattle_fattening_manual1dq2k.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/lumoponoramiwiw8jwkh.pdfIn PDF document text
    • http://busurman.space/dog_licks_screen_video_lwpl7cfmj.pdfIn PDF document text
    • http://rafale.store/83569941580mcq2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367287/normal_5ff1eea28e942.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379471/normal_5fee08eca42c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403954/normal_5fd77bb153587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427799/normal_6012fdf910c18.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_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 5428 bytes
SHA-256: e4731d83d0725b43a4f80d8dfc6baf1fa8fd616efe15c82148b29758f79ec46d
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 10924 bytes
SHA-256: d7de78dbc58454b441d071de86ca7dd683d10c02a2a039900664724ff5b8676a
font_02_sfnt_off0001253b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 17228 bytes
SHA-256: 45b4a70d809b40856884b456afca316fc337cb647b924533dcaa4870a49656d6

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