Malicious PDF — malware analysis report

Static analysis result for SHA-256 405b553469e886b9…

MALICIOUS

PDF

68.0 KB Created: 2021-02-14 20:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0027c7544cc4ccac34a4a8d3f47a578f SHA-1: da5c20d68a76745ff9f485b90563091908588225 SHA-256: 405b553469e886b9e593584df58a5463c0cd3435580bc10bc61d6ba962e7867e
126 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, indicating a phishing or trojan payload. It contains multiple embedded URLs, with one prominently featuring a search term related to 'blue heelers for sale in texas', suggesting a lure to a malicious website. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=blue+heelers+for+sale+in+texas PDF link annotation
    • https://cdn.sqhk.co/sixojifez/Xk6zS2Q/best_of_2020_songs_mp3_download.pdfIn PDF document text
    • http://valupimabo.22web.org/elementor_template_blog.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/6iaghSF/85366138229.pdfIn PDF document text
    • http://futegejetebe.22web.org/9394281919.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/winter_mountain_sniper_modern_shooter_combat_apk2q95h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/36843917619.pdfIn PDF document text
    • http://mowiwanafiv.epizy.com/muwiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/vasotudidizuxej.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/tulegipewapitepuvovugexe.pdfIn PDF document text
    • http://posugez.epizy.com/cpl_flight_test_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/9515849492.pdfIn PDF document text
    • http://xafamikipu.epizy.com/southampton_maps_and_visitor_information.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/bradford_white_mi5036fbn_parts_manual.pdfIn 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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28C 4972 bytes
SHA-256: dc1588d4e1f09cf2a749a549ce5cbd25c689dd9e531672e86f329c81d6ca037c
font_01_sfnt_off0000d36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36A 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0000decd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECD 10548 bytes
SHA-256: fa78c78054b0463e1544db48efbb20a8ace4fede8669d1121761b4089dbdcc8d

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