Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac3d5db8b4e75a1…

MALICIOUS

PDF

83.7 KB Created: 2021-03-03 09:05:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0cfdcc44191eb9f0b0e8dd5c78fdae82 SHA-1: d52e08780a6f88c4b82c7621ffab9408265f7320 SHA-256: 0ac3d5db8b4e75a199a5647385679fdfa73f0e097fb142f572777ab31f36f39e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The primary attack pattern observed is the creation of a link farm within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/aws?utm_term=how+much+is+brian+tome+worth PDF link annotation
    • https://bosagibanili.weebly.com/uploads/1/3/2/6/132682134/8654482.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/ujiggPK/39647127365.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/iU1geGJ/underrated_kpop_girl_groups_2020.pdfIn PDF document text
    • https://funoridarudaru.weebly.com/uploads/1/3/5/3/135304061/6fc93c0a2.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/hbMMOig/61064851164.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/dgchda6/best_video_player_app_for_android_without_ads.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxogife/mmfhigi/directv_now_channel_lineup_and_comparison_by_package.pdfIn PDF document text
    • https://jevijoju.weebly.com/uploads/1/3/5/9/135978445/a4d8e82c9f1.pdfIn PDF document text
    • https://cdn.sqhk.co/badisasi/hqrVWjb/beard_oil_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/kogeledewafo/kVBmbie/home_assistant_integrations_config_file.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/86504339470.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nefunupu/98259052927.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/zedura.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/little_house_on_the_prairie_book_set_order.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/waltzes_chopin.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/44801565075.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/tekoritexofuvet.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/raguruxinisuribaxifo.pdfIn PDF document text
    • http://fopagozijudiri.epizy.com/66401315770.pdfIn PDF document text
    • http://zatigiragu.epizy.com/how_to_train_your_dragon_series_2021.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 5080 bytes
SHA-256: e30199d33254c93a0ddc7f6506ef6fca81b3a632b0f0f88a364d2eabbbf4e19f
font_01_sfnt_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 11216 bytes
SHA-256: 3316b3d064f9829d71e8aa1417dc925d3b64cb6bf6e105ac198a9a79e59aace8
font_02_sfnt_off00013313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13313 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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