Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9aa20ccd6731041…

MALICIOUS

PDF

84.5 KB Created: 2021-03-24 19:31:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 216f305b775e7a9dc59aa237a13fb893 SHA-1: 8c97b616dd91c893a5729622f102f0b968976add SHA-256: a9aa20ccd67310410d51956a5f09bafdfd6109f5ded5986541caea3cf35baa57
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains a question about a Nespresso machine, likely a lure to engage the user and encourage clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=why+is+my+nespresso+vertuoline+machine+so+loud In PDF document text
    • http://vowujebotoza.mywebcommunity.org/list_of_american_army_ranks_in_order.pdfIn PDF document text
    • http://kopolade.22web.org/8222580683.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/joint_venture_agreement_forms.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457582/normal_60081fc12faa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453098/normal_5fe7b5c09d497.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427793/normal_5fe252c64c682.pdfIn PDF document text
    • http://bogaxusamukuxid.22web.org/37447480684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387590/normal_5fc7c5f49ccf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426556/normal_60003a9bc2ea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_6015bbe9d8525.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487200/normal_5fc5aff325610.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/how_to_make_someone_fall_in_love_with_you_farouk_radwan_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bixasejefo.rf.gd/solar_panel_types_comparison.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_5d662591ed04449ab1909c50f8d72b8f.pdf?index=trueIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_5fd57d3ba55e47228d06f0e3cb54bf61.pdf?index=trueIn PDF document text
    • http://lapetagalelan.myartsonline.com/sales_manager_responsibilities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4774d57d-2546-4441-b5a4-c64db24aa998/yoga_challenge_poses_for_2_easy.pdfIn PDF document text
    • http://jozorawoma.rf.gd/used_lg_v20_price_in_nigeria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3b9c1c-2abe-45e0-8f74-0f60487afac2/96999044842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a323660-7d1c-4690-acfe-ca4865786489/lightning_thief_series_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e11b9ec4-791c-4670-9819-3aac8fdf01ba/asus_laptop_q550lf_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9beb97a-4821-43c5-860b-7cc851a77153/how_much_do_baristas_make_at_starbucks_in_texas.pdfIn PDF document text
    • http://kavezusi.onlinewebshop.net/amylum_oryzae.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_off00010e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 5488 bytes
SHA-256: fe01e9cc6e78a3f549cbfee3aa9294606f08bfc3a7e247ffd33efb2ef2fc2d9e
font_01_sfnt_off00012096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 10616 bytes
SHA-256: 486b0a120bab8c506a1d79a6e4f2859c5b2aa4e78dc229df232bfc2b973cd873