Malicious PDF — malware analysis report

Static analysis result for SHA-256 c398479f04700488…

MALICIOUS

PDF

99.6 KB Created: 2021-03-06 21:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0b3e06d41cf512947dd57f719a42d67b SHA-1: ce9e4b35b0ae7aecd98990fd5d1ed880637a2679 SHA-256: c398479f0470048892817ae07e2a15faa47fc55c38bca6fa4d2174202963c408
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://bologen.ru/strik?utm_term=atomic+habits+summary PDF link annotation
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/128c0.pdfIn PDF document text
    • https://cdn.sqhk.co/busunava/hh3hfgj/dosorikapoxolibexatab.pdfIn PDF document text
    • https://jalesebexiw.weebly.com/uploads/1/3/0/7/130739560/jimasoxarax.pdfIn PDF document text
    • https://buvaranugabenu.weebly.com/uploads/1/3/0/8/130873820/datafitowo.pdfIn PDF document text
    • http://kazexezawulozij.mypressonline.com/2975956130.pdfIn PDF document text
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/bisepijuzenitawo.pdfIn PDF document text
    • https://rojaduvesasesa.weebly.com/uploads/1/3/4/7/134751848/gajotibuneduzab.pdfIn PDF document text
    • http://ranopefutaranuj.iblogger.org/avital_3100lx_installation.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/eo5jahj/my_bethel_canvas.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/what_is_chemistry_like_in_high_school.pdfIn PDF document text
    • http://venolilixe.mygamesonline.org/minn_kota_trolling_motor_plug__receptacle.pdfIn PDF document text
    • https://jijelejo.weebly.com/uploads/1/3/4/5/134590633/84311db8275.pdfIn PDF document text
    • http://gidilixad.66ghz.com/turning_the_hiram_key.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/20522643725.pdfIn PDF document text
    • https://ditomivowulute.weebly.com/uploads/1/3/4/6/134679561/13387e4fd4.pdfIn PDF document text
    • https://sadijamozu.weebly.com/uploads/1/3/0/8/130814559/fujejumilizu.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/VhdGqmY/dulujizunege.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/how_to_check_toner_level_in_brother_printer.pdfIn PDF document text
    • https://cdn.sqhk.co/sawomunuj/fjb5Jjd/i_will_touch_base_with_you_shortly.pdfIn PDF document text
    • https://vuwugaletop.weebly.com/uploads/1/3/4/5/134588193/2a77978162d8.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/vmjeQ8C/vsco_lightroom_presets_zip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujefozumuresul.epizy.com/hotspot_vpn_free_mac.pdfIn PDF document text
    • http://zifasodokid.epizy.com/envato_market_word_templates.pdfIn PDF document text
    • http://sujawusoxenum.rf.gd/building_information_modeling_lifecycle_management.pdfIn PDF document text
    • http://ludoxijijux.rf.gd/xezilomilunuwelawizo.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_off00014863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14863 5240 bytes
SHA-256: 9763c36ca93395e1144c9c8c8bd58709274036af70cabb82a04bde92fb439334
font_01_sfnt_off00015a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A0D 11236 bytes
SHA-256: b4145245a8e30ef00732fee179e64618cfb2bff38814d578a91a951db5988adf