Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc743bc563a5622…

MALICIOUS

PDF

84.1 KB Created: 2021-03-23 06:08:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27907080beb6ea976ca1b775811e93f8 SHA-1: 9143d06d6d34422f23b45527b2a286b465fa99ae SHA-256: 0fc743bc563a56221cbfdbd558bf3d49d8e6aaa605a8a5cd35d534b4f2580b9f
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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 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://gimoguvi.ru/wix?keyword=form+perception+theory
    • http://vimabanu.sportsontheweb.net/sufela.pdf
    • http://rusakadovub.sportsontheweb.net/ponevoxuparadoganiwazadop.pdf
    • http://vebifitapex.mypressonline.com/1923285559.pdf
    • http://rubitadix.22web.org/pesufadodujudinunug.pdf
    • http://rilomenininun.getenjoyment.net/silver_eyeshadow_looks_black_girl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_7b4fc61872d143babe397355cd44c499.pdf?index=true
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_e0edef17ddde4502a47a56ad72cc276c.pdf?index=true
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_bf26f73a49a0411085b6774dd9df9a26.pdf?index=true
    • https://uploads.strikinglycdn.com/files/92628e16-41e7-40ba-850e-328c6fbe2f65/dell_optiplex_7010_sff_cpu_upgrade.pdf
    • https://s3.amazonaws.com/wegemebufojafak/adding_fractions_coloring_worksheet.pdf
    • http://zerekigukazaja.epizy.com/38414973616.pdf
    • https://6974b9b2-fc2a-4e9b-9495-84ff65489eb7.filesusr.com/ugd/395280_9f8ec524554c445d88be4f3f360de08a.pdf?index=true
    • https://s3.amazonaws.com/wakuzidi/burofutuvosa.pdf
    • https://uploads.strikinglycdn.com/files/11ffa13c-1b31-47f6-8f7c-af7a343377a1/41548551837.pdf
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_cd1a554311f04be5bc4d814605068a45.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f86e2b02-0b7a-4e8d-ac19-b3caff9b5bae/mixojenaledapapifasug.pdf
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_bbaf0b920daf417aa54a397051003d4f.pdf?index=true
    • http://zuvodokisezimim.rf.gd/anesthesia_made_easy_jeff_steiner_download.pdf
    • https://uploads.strikinglycdn.com/files/b8118876-2202-49ad-a164-a911e3036842/which_master_of_orion_is_the_best.pdf
    • http://lesexugisitu.rf.gd/12389694156.pdf
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_622aded4f8d6491eaa7e0553eca01d14.pdf?index=true
    • https://s3.amazonaws.com/dugibabafod/poetic_devices_match_up_worksheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd1e.bin
425255f397ef5a6420f90a557e36a3f4fb4b66c4e30b1acca8f194376b765618		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 4600 bytes
font_01_sfnt_off00010c98.bin
e3f443665eed51d06456ae20481a1c531bf9eed922a9b99530e9f1280ea82e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C98 12696 bytes
font_02_sfnt_off0001353c.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1353C 4324 bytes

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