Malicious PDF — malware analysis report

Static analysis result for SHA-256 a002fc20cfdc4ddc…

MALICIOUS

PDF

68.4 KB Created: 2021-04-05 19:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3302c03c8bbbc42e8167be70b5537f4 SHA-1: a76dc6d532f289a5dba1fbbd393cbebdf9b79ddb SHA-256: a002fc20cfdc4ddcb6942cf7fbcbb9ec8084f7940cdf1d86c8c7e24b07303f84
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and the document body, though heavily obfuscated, suggests a lure related to a 'calculus a complete course pdf free'. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. The presence of numerous external URLs further supports the likelihood of this document being used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://nipisod.ru/award?keyword=calculus+a+complete+course+pdf+free
    • https://cdn.sqhk.co/fatepotax/agghaKH/16184298280.pdf
    • https://cdn.sqhk.co/xavaxonad/ggjjgOp/dumebotipukazaviniradixa.pdf
    • https://cdn.sqhk.co/rofezurit/ihjibcL/scientific_reasoning_the_bayesian_approach.pdf
    • https://cdn.sqhk.co/zereseful/jfijmgh/32796037322.pdf
    • http://mscredit.info/8022158605469dlc.pdf
    • http://mavito.online/sarapunifamamipevozp8p59.pdf
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5fdc45757506a.pdf
    • https://cdn.sqhk.co/patizuruf/4Qhaojd/nalixebitisiko.pdf
    • https://cdn-cms.f-static.net/uploads/4499972/normal_601209510bf00.pdf
    • https://cdn-cms.f-static.net/uploads/4469623/normal_601261e17ef96.pdf
    • https://cdn-cms.f-static.net/uploads/4420761/normal_60426f26622a4.pdf
    • http://meriline.store/65240223588wytxi.pdf
    • http://nonretloli.site/95912409362lbx8n.pdf
    • https://static.s123-cdn-static.com/uploads/4450047/normal_5fef8d1b05c66.pdf
    • https://cdn.sqhk.co/takejirasomu/c6icpid/josorotuvo.pdf
    • https://cdn-cms.f-static.net/uploads/4459784/normal_605aa65c2c754.pdf
    • https://static.s123-cdn-static.com/uploads/4469633/normal_5ffa6dd0e5053.pdf
    • https://cdn-cms.f-static.net/uploads/4407777/normal_605673bbcf8c3.pdf
    • https://cdn.sqhk.co/nojebimit/Goehihd/red_star_sunglasses_amazon.pdf
    • https://cdn.sqhk.co/gapebeve/hifVAij/cet_delhi_polytechnic_online_form_2019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce74.bin
630d6276b95e90791d60d702f7bbdf41364293184cc7656860f47359c78b7fca
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE74 5208 bytes
font_01_sfnt_off0000e00c.bin
2513773016ab39e4011530c01971bcc9b883360701f882d83fb05dc30dbcdefa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 10488 bytes