Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a81cea7411c30a…

MALICIOUS

PDF

69.0 KB Created: 2021-03-22 22:07:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 22ec89d29e1a9ac88e7a7c2efc34955c SHA-1: 6340a12699160fa659c444c23856cf9a0b09a2a1 SHA-256: f0a81cea7411c30aea3bd48db846075edb92c29fb22dbe13bb27c11ac5163e4b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, some of which are hosted on disposable domains. The primary purpose appears to be SEO manipulation or directing users to potentially harmful content, rather than delivering a direct payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=cane+toads+an+unnatural+history+video+worksheet+answers PDF link annotation
    • http://firstdoctor.xyz/king_lear_quoteszwvi2.pdfIn PDF document text
    • http://zalavsky.ru/ahqaq_ul_haq_book_urdum8zi4.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/make_mead_like_a_viking_book.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/clause_49_of_listing_agreement_2020.pdfIn PDF document text
    • http://pimesizawox.sportsontheweb.net/rcl_3000_rechargeable_remote_control_lantern_battery.pdfIn PDF document text
    • http://axacheat4.xyz/fesuwudajawuvule5zbqg.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/what_is_scholarly_writing_in_nursing.pdfIn PDF document text
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/jikuvulajozi.pdfIn PDF document text
    • https://wirimodarezekas.weebly.com/uploads/1/3/5/3/135314182/1709605.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/d439a9ef-7f88-45e0-aae1-aa598485df99/48415006588.pdfIn PDF document text
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_6d97ee7d37ee4a0d8c0e9d1823186ed8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ea97f1d-8567-4e2b-af72-2b253f379cb1/37047130648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a6972d-39f5-4a15-b21e-5af22ba66499/alaska_driving_licence_requirements_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f06e6f49-3cee-4085-be9d-393fed000345/jelemapinumug.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_f03c5af7d1a74530b417bc259b171a32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8a92c73-4c3d-43f9-8c89-02f1c97fd9e9/en_bonne_forme_answer_key.pdfIn PDF document text
    • https://dd6f0c70-611b-430f-b219-ee0593fd0e1f.filesusr.com/ugd/d60051_016ca4b479e24b14956c06ea6a9023ee.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_off0000d052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD052 5136 bytes
SHA-256: f58231afe37958243e7a9834288fca6c0068169518662f623d93f1bd9e2985c6
font_01_sfnt_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 10736 bytes
SHA-256: 6ef9ff5984d5508d0cc50fc6a42ccf1fb479b7a3575a5cc9551989fd97476c40