Malicious PDF — malware analysis report

Static analysis result for SHA-256 52481b794ab1fc14…

MALICIOUS

PDF

75.1 KB Created: 2021-05-07 19:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 83e9b16bd0b53c10fa8588c725211ba6 SHA-1: 54804d16d8efd1e0e406ffe76e5bdc8478e80250 SHA-256: 52481b794ab1fc14e2b61e6b727b5dddce053cdcfb2f0e32786ec6e8993288a8
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links pointing to other PDF files hosted on various domains, suggesting a link farm for SEO manipulation or to distribute further malicious content. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/strik?utm_term=audio+technica+at-lp120xusb-bk+direct+drive+turntable PDF link annotation
    • https://bifekanivixu.weebly.com/uploads/1/3/1/4/131408854/7e061.pdfIn PDF document text
    • https://nunosutelakib.weebly.com/uploads/1/3/1/3/131383720/9627633.pdfIn PDF document text
    • https://jipafedi.weebly.com/uploads/1/3/0/8/130813136/bedofi-jawef.pdfIn PDF document text
    • http://kilijosizujowo.medianewsonline.com/35126962009.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/hahahjF/baby_monitor_phone_app_android.pdfIn PDF document text
    • https://mutazodot.weebly.com/uploads/1/3/0/8/130874237/xelifefazi-safovot-vaferinivawol.pdfIn PDF document text
    • https://zedabobosarafon.weebly.com/uploads/1/3/0/8/130813357/b2908.pdfIn PDF document text
    • https://dofolemabumef.weebly.com/uploads/1/3/4/4/134458616/13cae4774357.pdfIn PDF document text
    • http://xijivedijimidip.mygamesonline.org/translate_japanese_to_english.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/BJhgfub/youtube_bass_booster_app.pdfIn PDF document text
    • https://zazewefagawi.weebly.com/uploads/1/3/0/7/130776698/5619923.pdfIn PDF document text
    • http://niwobupiku.iblogger.org/how_to_take_pictures_in_portrait_mode_on_iphone_6.pdfIn PDF document text
    • http://jetolad.iblogger.org/veritas_mk._ii_honing_guide_deluxe_package.pdfIn PDF document text
    • https://penopetidurip.weebly.com/uploads/1/3/2/8/132815040/9377239.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zakefozufasedi.epizy.com/19466717838.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/ejemplos_de_un_dilogo_directo.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/what_are_the_sustainable_development_goals_in_ghana.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/mumenuzujowix.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/what_is_another_name_for_nerve_cells.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/71939243263.pdfIn PDF document text
    • http://mibexumobanoko.rf.gd/45757945115.pdfIn PDF document text
    • http://gejagixuz.epizy.com/57313630038.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_off0000e1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A2 5840 bytes
SHA-256: 8556da563efcc4d7c4d02a85dccf0bdcecf0d4766b6d6304b393a70e32d23750
font_01_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 11584 bytes
SHA-256: 17be0347b3cea6ffc2fc2a87ace4eac394d3a94145a76d0d2444e62a0044844b

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