Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc42425e6441c392…

MALICIOUS

PDF

68.0 KB Created: 2021-03-09 06:53:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 228a482b7a8bd56788cf1833b6e1a96d SHA-1: 9596caebc72bf17521e40aad4ed4a09b5334b374 SHA-256: dc42425e6441c3920ceea460e22273332e8c3c283810fd79532432aa6801dfdf
194 Risk Score

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/123?utm_term=surprise+party+evite+template PDF link annotation
    • http://forajadafogaxuv.medianewsonline.com/71535659301.pdfIn PDF document text
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/51f8c.pdfIn PDF document text
    • https://furimulu.weebly.com/uploads/1/3/1/4/131411024/3948448.pdfIn PDF document text
    • https://vakasuvarepem.weebly.com/uploads/1/3/4/3/134328097/gijazasafux.pdfIn PDF document text
    • http://memisada.mygamesonline.org/spectra_s1_not_working.pdfIn PDF document text
    • http://kudusakepupa.sportsontheweb.net/81886615930.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/fxX5PfH/26133814813.pdfIn PDF document text
    • https://cdn.sqhk.co/nokikijun/ijXIehf/240sx_drift_tune_forza_horizon_4.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/5807131.pdfIn PDF document text
    • https://gatudawi.weebly.com/uploads/1/3/1/3/131379110/jedomi-begexixumor.pdfIn PDF document text
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/rubokolenomelav.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/jluqPew/extreme_motorcycles_atherton_qld.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://davinawoguzag.atwebpages.com/what_are_some_core_strength_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27ee5be-cabd-4e27-abfd-dcb0840c7f99/how_do_i_unblock_a_number_on_my_panasonic_landline_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c3e68c-3509-483e-90af-bd7dcb72fa2c/american_history_x_cast_fat_guy.pdfIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_2ad1236049524279a6346c9910b19039.pdf?index=trueIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_dc73876965774a5c8a8997fa8a9a96ce.pdf?index=trueIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_50f2e374a6a1475997064a5a011df370.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a93936-94dd-4678-8333-52bfb6f9ac44/29922760517.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_off0000cf14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF14 5232 bytes
SHA-256: 7e443af62ef696d26cde64976d5e087a377e303ae144771e537c36180e382652
font_01_sfnt_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 9976 bytes
SHA-256: e2bfa7c6dacecc91c47db3158f1530200f3aa7d3e96d591d2f21139ecb8ed46e