Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7a09dc8b0e6a11…

MALICIOUS

PDF

75.8 KB Created: 2021-03-27 16:53:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c14eb4903d646513538769a093151939 SHA-1: 678308effd4b9e9c62641d61eeddd4584366731f SHA-256: db7a09dc8b0e6a1192f9b53a1557f5f07949b918e51cf43052dffeff6e097928
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://ponafet.ru/wix?keyword=relative+atomic+mass+worksheet+answers PDF link annotation
    • http://svarka-aurora.online/kodenkan_danzan_ryu_jujitsu_associationu7hft.pdfIn PDF document text
    • http://noverst.xyz/how_to_listen_to_streaming_music_while_swimmingttsfv.pdfIn PDF document text
    • http://ekzo-fruit.ru/cold_calling_email_templateshf83y.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/2007_lamborghini_gallardo_spyder_horsepower.pdfIn PDF document text
    • http://prolac.ru/merge_dragons_event_keys_201962vte.pdfIn PDF document text
    • http://blockingscenery.com/65606371297ppubv.pdfIn PDF document text
    • http://ampinternational.org/les_trois_mousquetaires_filmlh0bl.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/gasomusu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/competition_car_aerodynamics_simon_mcbeath.pdfIn PDF document text
    • http://simanij.rf.gd/zazamosisum.pdfIn PDF document text
    • http://rurodebijusidof.epizy.com/38512033194.pdfIn PDF document text
    • http://pevipitoz.atwebpages.com/23433100783.pdfIn PDF document text
    • http://zenadeguposu.rf.gd/cowboy_chicken_menu.pdfIn PDF document text
    • http://fidikaxano.myartsonline.com/nigonabixatijix.pdfIn PDF document text
    • http://pobevezegudam.epizy.com/how_to_charge_nikon_d5200_with_usb.pdfIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_20cd0828fb9043dfab8ed5d8e562ed62.pdf?index=trueIn PDF document text
    • http://gesovupa.epizy.com/uji_statistik_parametrik_dan_non_parametrik.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_9eb4035c93ff4ae48f5a3517073068f3.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 5264 bytes
SHA-256: 4552463eadda405b67b09639a2652a93889e4e7a862f05503ee1ff0d9eea6e9b
font_01_sfnt_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 11328 bytes
SHA-256: a1899f90be95ab169464c266ec68af6a9d655a775fdfe1dccf6b6b38c714638e

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