Malicious PDF — malware analysis report

Static analysis result for SHA-256 516cf00cdd8842eb…

MALICIOUS

PDF

82.5 KB Created: 2021-03-23 04:06:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 33de422268306a7e0d5efb4a090496eb SHA-1: 1b13d21c424b2eaf2a2cab781b2242e7365646cd SHA-256: 516cf00cdd8842eb0de4eb5b22f231562064628f3796592bca63870554b8c677
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/strik?utm_term=adobe+premiere+pro+2018+crashes+on+startup PDF link annotation
    • http://rogemuso.iblogger.org/sizojusufukegodu.pdfIn PDF document text
    • http://meduduwaje.22web.org/android_auto_day_night_mode.pdfIn PDF document text
    • http://sexonorom.22web.org/.pdfIn PDF document text
    • http://masonufidowex.iblogger.org/22933050520.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/354c05b3-b7bf-4f68-b76b-3eb46301c6e2/marvel_movies_in_order_of_release_avengers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d15b5f-7266-4ffd-a28a-a348a94ea8c6/78999511149.pdfIn PDF document text
    • http://sidubavomiwur.rf.gd/73159955307.pdfIn PDF document text
    • http://tabizamasozelo.epizy.com/zunotux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/409bff84-e70e-40e9-8d01-84660de21bda/86742804390.pdfIn PDF document text
    • http://digudago.rf.gd/73518669188.pdfIn PDF document text
    • http://mabobasator.epizy.com/caricatura_politica.pdfIn PDF document text
    • https://49884795-3b66-401c-adaf-b59e999553af.filesusr.com/ugd/8bd6c9_e4cf16671c0e4bb5b0b15819c7d5ec86.pdf?index=trueIn PDF document text
    • http://dejarovagozude.epizy.com/luciferase_reporter_vector.pdfIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_ccad110bafb44c9ea63b7d2300604bca.pdf?index=trueIn PDF document text
    • http://suzitemilivofer.epizy.com/pufutuwotetezowujezalize.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/78118399212.pdfIn PDF document text
    • http://wedepije.epizy.com/can_you_use_a_dremel_to_cut_stone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf1b7d2-529e-4342-a28f-4e1dfddbd6b3/lexile_range_for_8th_graders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fd28c94-03cc-4008-af40-d575aeee5469/power_precision_cooker_error_code_ee1.pdfIn PDF document text
    • http://fugodijuw.rf.gd/wojugiluborefagonuduweze.pdfIn PDF document text
    • http://liwusetokabozil.epizy.com/33112073878.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/woman_yelling_at_cat_template.pdfIn PDF document text
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_0d4a04f2a3464568bb91692dc623821c.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 5928 bytes
SHA-256: fd53ed790e3610bf312e1e0fbd692ccc81bd21fcda8421ae8b682d707a4c2c2e
font_01_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 12156 bytes
SHA-256: b943b97509445ba39339d252c64f5b3fa0b5684a8a8c130a3e151b13993d796d
font_02_sfnt_off000124a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A5 16388 bytes
SHA-256: a4f616c8ed03231f927c8f6725ddfb6aed79ba1e9c0c9257d690ec40f184d4cc