Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c12ee9658206d7b…

MALICIOUS

PDF

81.5 KB Created: 2021-01-11 23:36:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c98a13b5ca5db23009c7b42ec0dbaa82 SHA-1: aaafd47ca760a85262e9dda6708855f0ee82d6c8 SHA-256: 8c12ee9658206d7bd0e3191083e3efb1c403b5dd82504a14d9b6f248d5a77794
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to various sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded links are the primary attack vector.

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
  • 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://gettraff.ru/123?utm_term=sketchbook+cover+ideas+paint In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421787/normal_5fb9364416378.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/ib0fbRx/ice_hockey_rules_simplified.pdfIn PDF document text
    • https://nozabuzewetuk.weebly.com/uploads/1/3/2/6/132683147/8089139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450141/normal_5fda30cec4f41.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/kapowapax-zasowo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375885/normal_5ffb6ad465fbb.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/hcge5f1/1st_grade_worksheets_english.pdfIn PDF document text
    • https://folanejo.weebly.com/uploads/1/3/0/7/130776558/ce8fcb9221c43a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_5fb5fb6ce39d9.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/tarizirefevifab/rofezupunujowifim.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/chikati_gadilo_chithakotudu_movie_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/software_estimation_template_xls.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/bimipijumegexigozow.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/crooked_kingdom.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/resume_example_for_job_application.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_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 5496 bytes
SHA-256: 8071c9640da097efdff76f2ac7d7d841057b2ad6dd8b09738ae64776153930d8
font_01_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 10824 bytes
SHA-256: ee831da59051b601ad48db4184db2ac3735713846b6b3d7181f40a3ad63489ab
font_03_sfnt_off000122c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C4 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0

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