Malicious PDF — malware analysis report

Static analysis result for SHA-256 37175c9bce7164ab…

MALICIOUS

PDF

96.2 KB Created: 2021-03-10 22:16:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c0dc0c950a303ccb31d8d1cdd4aa3a3e SHA-1: 11242060e8c392243e59ee61523202e5e2be6ae6 SHA-256: 37175c9bce7164ab2dba54af9c87cf336712d105744160d3267e8cb9ace44169
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The heuristics indicate it functions as a link farm, directing users to numerous external URLs, one of which is hosted on disposable infrastructure. While no scripts were explicitly extracted, the presence of external URIs and the link farm behavior strongly suggest an intent to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/123?utm_term=bollywood+old+horror+movies+free PDF link annotation
    • https://bajigexok.weebly.com/uploads/1/3/4/1/134131467/4697254.pdfIn PDF document text
    • http://submonster.xyz/78919814954s69i7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_5fd7c5643dd0c.pdfIn PDF document text
    • http://speak4pro.com/spalding_basketball_hoop_spare_partsxvrou.pdfIn PDF document text
    • http://igcopyrightclient.com/power_pro_white_braid_reviewzn1i7.pdfIn PDF document text
    • https://sixutaxujarupi.weebly.com/uploads/1/3/4/8/134882582/5307084.pdfIn PDF document text
    • http://girlita.space/le_veritable_dragon_rouge9uyz6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376087/normal_6026ca4f2defa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_602f60519e250.pdfIn PDF document text
    • https://poriveba.weebly.com/uploads/1/3/4/3/134316211/e2ae7df8c9d.pdfIn PDF document text
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/binatoxulemi.pdfIn PDF document text
    • https://juxufosuzuvol.weebly.com/uploads/1/3/1/4/131437906/e151362b81182.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/dc18f.pdfIn PDF document text
    • https://gigunomivu.weebly.com/uploads/1/3/0/9/130970016/kimewa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bibalaluroxute.epizy.com/midnight_in_the_garden_of_good_and_evil_movie_synopsis.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/tariba.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/conics_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/best_decaf_coffee_consumer_reports.pdfIn PDF document text
    • http://bovuzigaratufob.rf.gd/buzzer_round_quiz_questions_and_answers.pdfIn PDF document text
    • http://lidufaz.epizy.com/instruction_manual_whirlpool_gold_series_dishwasher.pdfIn PDF document text
    • http://lotopoxomujezu.epizy.com/latest_movies_for_in_hd.pdfIn PDF document text
    • http://tokavasetalan.epizy.com/binding_energy_of_nucleus.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://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_off00012503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12503 5240 bytes
SHA-256: 2bce5e346ae840d7a43c93ea23ba75d1b26c89bb52d32a1962c8719dcf05a995
font_01_sfnt_off000136c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C9 12312 bytes
SHA-256: fb9227c2a952d61f4e9faba7e1c71b407a2d2b993f7c1545c1fde0b003558305
font_02_sfnt_off00015ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE1 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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