Malicious PDF — malware analysis report

Static analysis result for SHA-256 48fffefa6b9ce85a…

MALICIOUS

PDF

78.6 KB Created: 2021-06-05 17:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 633f009fa6b48cc9a1ee45525961b4bb SHA-1: 23719ca50a8bc62ffcaddea6a89b6b210c75c9d4 SHA-256: 48fffefa6b9ce85ad653dae8200a2e8040bd168899017ea127a605f10d45d094
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely serve as lures to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://drafthe.ru/pbw?utm_term=prefix+and+suffix+worksheets+with+answers+grade+6 PDF link annotation
    • https://welogodeketi.weebly.com/uploads/1/3/5/3/135326703/najerox.pdfIn PDF document text
    • https://wizakamulo.weebly.com/uploads/1/3/4/0/134017688/3042292.pdfIn PDF document text
    • https://nijuvijoz.weebly.com/uploads/1/3/1/4/131408832/lekerasuvok.pdfIn PDF document text
    • https://bomovote.weebly.com/uploads/1/3/5/3/135398027/bugevatupaxi.pdfIn PDF document text
    • https://kawepuwaseleza.weebly.com/uploads/1/3/4/8/134849925/kijamatuje.pdfIn PDF document text
    • https://bipipabogudas.weebly.com/uploads/1/3/1/1/131164499/ratumo_jotowoto.pdfIn PDF document text
    • https://kupafejesuxab.weebly.com/uploads/1/3/4/6/134650707/mosokusonum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62feda1-a7dc-4646-9979-cf153483adc9/pokemon_tcg_theme_decks_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82cf986f-e0f5-4b49-8312-26221052200a/sutevutitakametofixivi.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/f/introduction_to_statistical_quality_control_8th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beb85f84-c7a8-4a56-9edd-f95551b643f4/52035144123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95af991-65c1-4096-9f7e-3e5428cd90c3/tibizefimiz.pdfIn PDF document text
    • http://zosajivapesi.pbworks.com/f/mi_propio_auto_chapter_9_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9679f802-8b51-4ece-88a1-52f17e362ca3/apc_smart_ups_1500_battery_replacement_instructions_hot_swap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bddef52b-5541-4f97-b863-3ce86bf48e13/82829093914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eab1381-6a08-4997-8fc1-c04226eb48d1/25456042400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfa172e9-6eff-4258-a42a-06da27e9dc9a/19499723420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38aa55f4-9a40-4049-b06c-c96a3e8acc22/how_to_arrange_a_to_z_in_word.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/f/52911297448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed4f32f-8c16-4b0b-8f49-bc13a23278e4/60694850845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a303aa-2bf5-42a7-8d69-573e2b6d42f5/68266623880.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/w/file/fetch/144516609/what_is_operational_definition_of_terms.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 5516 bytes
SHA-256: 35736a36c0bfb8f148ef9f4a24023c6785e216bcba9f5a72540dfcee9d1bfdeb
font_01_sfnt_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 10576 bytes
SHA-256: fad588aeaa8b7b9b584087d5e6cb70f14b3ba29536954e20853fa46e70f43e02
font_02_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 16144 bytes
SHA-256: f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29

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