Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53217aaffabc9a4…

MALICIOUS

PDF

110.2 KB Created: 2021-03-14 16:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 62f3e980b1b51023937f4467edb2381d SHA-1: 64ff2f6b9675e88bb9b17ab8f32440bc342d4385 SHA-256: e53217aaffabc9a443db966e4f632cb3bd4e335883718c545a509ccfd52ddb67
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The primary lure appears to be search engine optimization content, as indicated by the 'utm_term' parameter in one of the URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://fokemale.ru/strik?utm_term=excel+2016+customize+keyboard+shortcuts+missing PDF link annotation
    • https://polokoxukoneg.weebly.com/uploads/1/3/2/8/132816042/452664.pdfIn PDF document text
    • https://gupobotinifetex.weebly.com/uploads/1/3/4/3/134338345/301662579c2.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/wufogedutag.pdfIn PDF document text
    • http://sell-toclick.online/gobewikexpq4g.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/5693397.pdfIn PDF document text
    • https://radasezase.weebly.com/uploads/1/3/4/6/134643415/dalejute.pdfIn PDF document text
    • https://mazerobuwi.weebly.com/uploads/1/3/1/3/131398334/2499693.pdfIn PDF document text
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/38ebd895879500.pdfIn PDF document text
    • http://agentsoft.space/camera_shots_and_angles_quizwrfzl.pdfIn PDF document text
    • http://generatorsale.ru/lg_inverter_direct_drive_washer_top_load_how_to_drain8afip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_f5dd4d9927e04f6f9901511001b1b0e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cdb8339-ab6e-4682-8771-bb7e6cce0a9b/tasadokumemutodaju.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/meade_8_lx200-acf_advanced_coma_free_teleskop.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/california_ambulance_drivers_test_answers_facebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2f1ab42-e451-487b-b12a-cd81a72abef6/what_are_opinion_signal_words.pdfIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_c8abed8f2c6c49a7877d995a8609cc6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/clasificacion_de_los_huesos_animales.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_acecc49461aa497abe733eca8ee52eeb.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_6757dbe852d048dc9c4c0a2bc46fd0e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eae3922-e87d-41be-bfd7-e859fe83c12f/33915000563.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F79 6216 bytes
SHA-256: fb70c1078fe78d258836b18f36fb4f7427e3e487082eb55a4eca4d3b8bdbae4b
font_01_sfnt_off00018495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18495 11276 bytes
SHA-256: f5b128eaf61431e43709f68c0cbef71b49fee3bbd00ce9a24c8e779e86af24df