Malicious PDF — malware analysis report

Static analysis result for SHA-256 e01543bdd513ae72…

MALICIOUS

PDF

77.6 KB Created: 2021-03-17 17:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fb32133e4842bf3d8b374cfa208db75f SHA-1: fa0fd897b164b2d9b0cb28f6a358334018293db3 SHA-256: e01543bdd513ae7228724016bcb9c298189fa71966b1e43e4577c1b7ef70dcc9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to various domains, likely for SEO manipulation or to host further malicious content. The presence of embedded JavaScript, though not fully detailed here, suggests an attempt to execute code within the user's browser, potentially leading to further compromise.

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
  • 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://leonvi.ru/wix?keyword=hamlet+act+4+symbolism PDF link annotation
    • https://selijejexo.weebly.com/uploads/1/3/0/9/130969160/8312876.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/how_do_i_turn_on_my_built_in_camera_on_my_hp_desktop.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/67bbbef42932d.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/square-d_40-60_water_pump_pressure_switch_9013fsg2.pdfIn PDF document text
    • http://maxobujixeweden.sportsontheweb.net/wijotidow.pdfIn PDF document text
    • https://daluruxixofofi.weebly.com/uploads/1/3/1/3/131398394/bujulapakemiwominij.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/jdNcTha/xojujezez.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/iiiRIig/xbox_game_streaming_preview_windows_10.pdfIn PDF document text
    • https://gatiwisukebemo.weebly.com/uploads/1/3/1/4/131438587/1950b470f.pdfIn PDF document text
    • https://tisawotaw.weebly.com/uploads/1/3/5/9/135993845/fomunifuju.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://uploads.strikinglycdn.com/files/8aae8849-9821-4953-bccf-2a74db6a83ed/85592611715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d3140ed-8e05-43d5-9092-c2db744525ef/jekowatizurifebufokomase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9bd7629-b417-4f11-9715-1d1a22e14e53/64446615465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a239f5-479d-47ac-9d3b-5185de86f0ed/momafetigemetusilak.pdfIn PDF document text
    • http://denefarow.rf.gd/sesofagejawamat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3085f829-0ab5-42e2-8069-a15e001f9a33/45496535015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ace0f55-e1b2-40b8-83dc-42de4e333f66/kufekipumobulalilajeru.pdfIn PDF document text
    • http://zugubegasi.epizy.com/what_is_the_spiritual_gift_of_wisdom.pdfIn PDF document text
    • http://jezosimo.epizy.com/baxojabanatewagako.pdfIn PDF document text
    • http://degejukifukux.epizy.com/informatii_despre_caderea_zidului_berlinului.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_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 4820 bytes
SHA-256: 6cdaaca3eb5f6537e1068b518257890892ef5431f0a3eb50901d887e27d4f73d
font_01_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 10480 bytes
SHA-256: 9b2460a617913d2316d1554e4ffbe795faf0214268b22f7f4f107f29529d2a86
font_02_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e