Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b4bf56ad710562…

MALICIOUS

PDF

79.9 KB Created: 2020-12-15 09:19:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9727b93bde3da4fa8f8f7abc80fa3d61 SHA-1: 0e3518d584a6be82ded09a4ecf18bf19e3c99079 SHA-256: 51b4bf56ad7105621b55a29f19f19eb39e6ba11d4f4cd3043467c44afc00f783
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to disposable hosting services and redirector infrastructure. The heuristic firings indicate that this PDF is designed as a link farm, likely to distribute malware or engage in phishing by directing users to malicious sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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.
  • 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://traffmen.ru/123?utm_term=la+paz+de+dios In PDF document text
    • https://pezojafabeton.weebly.com/uploads/1/3/4/4/134402057/dffe2903.pdfIn PDF document text
    • https://josadezabo.weebly.com/uploads/1/3/4/4/134490641/5460785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408709/normal_5fa4147dd572c.pdfIn PDF document text
    • https://lobizuwoxigamog.weebly.com/uploads/1/3/4/5/134515373/paruduketufu_sigigosopij_mejaw_wawogob.pdfIn PDF document text
    • https://paboludozov.weebly.com/uploads/1/3/4/3/134333588/wululinif.pdfIn PDF document text
    • https://rakikamizop.weebly.com/uploads/1/3/1/4/131437254/wevumaz_geronegudiw_belos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423757/normal_5f9a56e8f2c9f.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/89c460a3-5552-4e54-ac7f-284f4903d2ff/la_carga_del_hombre_blanco.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/spider-_man_cartoon_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eceada74-67d7-41ec-812c-04d79aaa852e/the_outsiders_chapter_8-10_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc9d141-46ef-46d3-ae8c-fe686aeead39/gusujor.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/avery_5160_template_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f14b71-9ab9-4964-8a27-92e66ff7cb24/el_universo_y_el_sistema_solar_1_eso.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_off0000e78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78E 4816 bytes
SHA-256: 535ab5cb7d29bb1fb5e44df436d961605ebd60c77bba064f947afe195b5abd09
font_01_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 11184 bytes
SHA-256: 364c8018958795bb4732107bde0996622675e70d1ab63a3e8f8e82d7bd68ed7f
font_02_sfnt_off00011cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 16028 bytes
SHA-256: 8345d1cc2b6b461b856d0454e2cf67edf5851291b6d0ebf21a7da0c9813a2b7f

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