Malicious PDF — malware analysis report

Static analysis result for SHA-256 550d5c0b9349f88e…

MALICIOUS

PDF

79.9 KB Created: 2021-03-23 18:12:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45aad3a3ef4180e08abf5742059ccb70 SHA-1: 6edec6dc7a3caa712b755438858a4d3f9615d23f SHA-256: 550d5c0b9349f88e9935c15cd07344e1230a1b7340c3dd54755965bde8ca6158
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'pelibifir.ru' suggests a phishing or credential harvesting attempt, disguised as a worksheet. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

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://pelibifir.ru/wix?keyword=parallelogram+maze+worksheet+answers
    • https://cdn.sqhk.co/rajemaramiw/OPicGT1/19391676665.pdf
    • https://cdn.sqhk.co/topazawu/hphd6ge/square_tubing_rocket_stove_plans.pdf
    • https://cdn.sqhk.co/katutilit/heMLCgf/gudazozadukerixenorit.pdf
    • https://cdn.sqhk.co/tifomogoketu/ieiiKhd/gevitawamureputudimonu.pdf
    • https://cdn.sqhk.co/jiluputumusi/hghSic5/minecraft_world_seeds_ps4_island.pdf
    • https://cdn.sqhk.co/mikedeto/Cgg7jik/lebara_recharge_data.pdf
    • https://cdn.sqhk.co/pesasotiro/pDqChi6/algebra_solving_equations.pdf
    • http://life50it.pro/2058303835622s4t.pdf
    • https://cdn.sqhk.co/dudumadopole/hgggPPL/29049436469.pdf
    • https://cdn.sqhk.co/sefibenip/hDKX2gd/roy_worldwide_height.pdf
    • https://cdn.sqhk.co/nuvexajamu/6Kagige/lethargy_definition_in_chinese.pdf
    • http://creditscorerepair.info/kutirugamiwawowumitozj4hr.pdf
    • http://biggymstoe.com/bidizelofomu2z02m.pdf
    • https://cdn.sqhk.co/gabazumad/Psx5fja/5713916836.pdf
    • https://cdn.sqhk.co/fotenulutis/gdgjlr8/52162867758.pdf
    • https://cdn.sqhk.co/xidizizo/pW5jEGQ/96261502815.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wazotojemov/46486378837.pdf
    • https://uploads.strikinglycdn.com/files/0dedbe64-5479-4ba7-89c5-c9325a8a8f19/pulgadas_a_milimetros.pdf
    • https://uploads.strikinglycdn.com/files/116118f9-2a26-4304-866e-8d77c3ac1019/how_do_you_fix_a_garbage_disposal.pdf
    • https://s3.amazonaws.com/xotomisen/greeting_and_farewells_worksheets.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb22.bin
82ab81280a0c7985567aff189d79e1c979c1aa7d5a3ee3a5dd68f6ca351721a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 5308 bytes
font_01_sfnt_off00010d1b.bin
f482442f5da7fe5e86b801a797a5c914e21d139ecb6108b35fd2c36a13091d54
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 11056 bytes