Malicious PDF — malware analysis report

Static analysis result for SHA-256 963bdc8bfe57d3fc…

MALICIOUS

PDF

67.3 KB Created: 2021-03-11 16:45:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 936e056c5bb3e6f26d3cda01fa8add35 SHA-1: 49b363b0a0477889bc9894239dde7f541a06a963 SHA-256: 963bdc8bfe57d3fca97144c3e32344ceed381c984924939821dc8c48feb7db60
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to a URL that appears to be related to downloading an 'apk' file, suggesting a lure for users to download and install potentially harmful applications. No scripts were extracted, but the presence of external URIs and the malware classification strongly indicate a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=task+killer+apk
    • https://cdn-cms.f-static.net/uploads/4419633/normal_600bd1fbeab95.pdf
    • https://cdn.sqhk.co/zadexona/bRibjbM/17521770769.pdf
    • https://cdn-cms.f-static.net/uploads/4481522/normal_602832b9ed8bf.pdf
    • https://cdn.sqhk.co/zolilobup/ia1jbii/3879692256.pdf
    • https://static.s123-cdn-static.com/uploads/4385028/normal_600036a6f31a0.pdf
    • https://cdn.sqhk.co/xovinexesun/gjyEifU/fitezes.pdf
    • https://cdn.sqhk.co/kixepijap/J1mGhbu/angry_neighbor_3._0.pdf
    • https://cdn-cms.f-static.net/uploads/4367286/normal_602a09bc64eb6.pdf
    • http://vodabutopidaru.getenjoyment.net/ap_human_geography_course_outline.pdf
    • https://cdn.sqhk.co/giganopof/9hjiijb/99161837960.pdf
    • http://figejewumoposes.getenjoyment.net/mugoripivodatadajatuwor.pdf
    • https://cdn-cms.f-static.net/uploads/4369905/normal_603b201c3d97d.pdf
    • http://ketoxitigojaluk.sportsontheweb.net/3338883289.pdf
    • https://cdn-cms.f-static.net/uploads/4414677/normal_60102ea5c39c2.pdf
    • https://cdn-cms.f-static.net/uploads/4369912/normal_6046a87424b20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/febopa/50061047209.pdf
    • https://s3.amazonaws.com/pilazi/chrome_history_android_time.pdf
    • https://s3.amazonaws.com/jadere/usb_host_checker_apk_free.pdf
    • https://s3.amazonaws.com/zarelusipofox/sql_join_interview_questions.pdf
    • http://metututeda.epizy.com/35396889988.pdf
    • http://latowetutut.epizy.com/what_jobs_can_you_get_with_a_computer_programmer_degree.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_off0000c116.bin
51b1156b9cde50505678146a2b511001fbd46869c9af21c3e93abc319bbe9d3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC116 4316 bytes
font_01_sfnt_off0000cfb9.bin
5066f7eb80ff0d2a4b46c201cc40004a20724fdae017d68f7a65623ab15cced6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB9 10064 bytes
font_02_sfnt_off0000f22f.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 4324 bytes