Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a5d740f8d470d8…

MALICIOUS

PDF

86.0 KB Created: 2021-02-28 12:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8f51869bc65acaca51b00dff66bc5c5d SHA-1: 1b1df817aa3948d01346ca606720c04cf47f0186 SHA-256: d2a5d740f8d470d8f8de9cee7b14d110f0f4404eddc3f010b29b8caa595bf189
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=how+to+smoke+ribs+with+a+masterbuilt+electric+smoker PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465704/normal_6031d335f2f6d.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/hbvPja2/89783552688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444626/normal_5fcb5fe6dcbe1.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/D4cSTgg/serabitipilizuwabufoj.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/whats_the_lowest_mortgage_rate_for_refinance.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/how_long_do_2007_chevy_impalas_last.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/Mixsihd/rush_truck_center_close_to_me.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/ii67Lhi/26434881852.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/how_to_open_midi_in_garageband.pdfIn PDF document text
    • https://xoxisosozujuna.weebly.com/uploads/1/3/2/6/132680853/4603177.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wizigipixe.atwebpages.com/jump_force_giorno_giovanna_gameplay.pdfIn PDF document text
    • http://digifasofow.rf.gd/reduce_file_size_quartz_filter.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/3693875034.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 5296 bytes
SHA-256: 5cd11f8d19065c5e85be364ca5834d9caf49c7ced6bf17ca53e0a8549dec9793
font_02_sfnt_off00011193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 10416 bytes
SHA-256: 37bdf010e158f52f9ce30426660c61faf220a8865eb6ca2a433f969fee148b85
font_03_sfnt_off0001352e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352E 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550

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