Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bb508ed6f3a7b7…

MALICIOUS

PDF

69.4 KB Created: 2021-01-13 18:24:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05c0ed323fd556ebf14e0a94e5e1742f SHA-1: bd82ee467a1e8cd28f69f4c6b2eb052a58d34b20 SHA-256: 76bb508ed6f3a7b77324e971d723984820b9d1e0d2caf1f4cdd15483ccf8b010
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 Weebly and S3 domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/aws?utm_term=fundamentals+of+physics+pdf+9th+edition
    • https://sagolofuba.weebly.com/uploads/1/3/4/8/134873879/vekijobakuran-sumarazusajebex.pdf
    • https://togurekeve.weebly.com/uploads/1/3/4/0/134040335/45e645da440860.pdf
    • https://site-1178275.mozfiles.com/files/1178275/convert_metric_to_english_worksheet.pdf
    • https://jalipixax.weebly.com/uploads/1/3/4/3/134340191/vumax_zugowajaba_bogog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/piwanisaj/acca_f6_uk.pdf
    • https://s3.amazonaws.com/baxunaf/cbs_all_access_canada_apk.pdf
    • https://s3.amazonaws.com/bakoloj/nowesobijupakuris.pdf
    • https://s3.amazonaws.com/zepifudoxapo/spherical_aberration_in_lenses.pdf
    • https://s3.amazonaws.com/mejigavukolu/tips_on_answering_behavioral_based_interview_questions.pdf
    • https://s3.amazonaws.com/suxiweke/xediwojogozex.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/76334804360.pdf
    • https://s3.amazonaws.com/nelizenejakarug/gipisojuzofudi.pdf
    • https://s3.amazonaws.com/mujesogi/86639401271.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c452.bin
c60e8e18a15f3f4b31e18445b67d2fde16177d2b4bb5ac00a8ad8eb5a9c701af
pdf-font-stream PDF embedded font (sfnt) at offset 0xC452 5396 bytes
font_01_sfnt_off0000d68d.bin
074b2ad85cc16139e79210e76b011256d14338a15b9ff6bf9846ccd62e51138f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 10524 bytes
font_02_sfnt_off0000fa69.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 4324 bytes