Malicious PDF — malware analysis report

Static analysis result for SHA-256 a559479598b05c38…

MALICIOUS

PDF

78.4 KB Created: 2021-04-08 08:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d918e06ce7c3fc1dd2c7f9d1368196ec SHA-1: 5df044c49d0b614ba0eefa5d3f9813867f6cb697 SHA-256: a559479598b05c3823dbc8c786c02a27104c76972f5c4882f2a7aed2565842db
186 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and contains numerous external links, many hosted on disposable domains. The PDF's structure and embedded links suggest it's part of a link farm designed to redirect users to potentially malicious sites, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The embedded URL `https://midufefew.ru/wix?keyword=baby+alive+my+baby+all+gone+commercial` is a primary indicator of the redirection attempt.

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://midufefew.ru/wix?keyword=baby+alive+my+baby+all+gone+commercial PDF link annotation
    • http://xexulijupofa.iblogger.org/is_ch3cooh_a_weak_electrolyte.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/an_introduction_to_parallel_programming_peter_pachecol9jay.pdfIn PDF document text
    • http://xosavetevo.22web.org/96913597222.pdfIn PDF document text
    • http://tekplafond.xyz/217450105239vea4.pdfIn PDF document text
    • http://legko.travel/91966335850b7717.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/47644601825.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/wozig.pdfIn PDF document text
    • http://zisapawiwako.mypressonline.com/neoliberalismo_no_brasil.pdfIn PDF document text
    • http://pixizosusonaxij.sportsontheweb.net/ap_grama_sachivalayam_syllabus_in_telugu_2020_download.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/13b46862-8ca9-451f-9c5d-c7bc8bfe289e/what_is_nvc_communication.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e532fd-91dd-4c39-9863-6a1a0f7c3b68/what_does_the_bible_say_about_the_trojan_horse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8d0a7a-aefa-42eb-a827-e14668021039/67881478112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26969ab3-6d24-4e61-a24a-b2930fb24c7d/how_to_get_rid_of_acne_scar_fast.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_542f352e49c34058b18949e57df2a678.pdf?index=trueIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_a82c0c4b671740e0bd3d5bff7a6d131c.pdf?index=trueIn PDF document text
    • https://37dcb74a-b492-4e6c-94d7-6984b04a3d7f.filesusr.com/ugd/01eaca_6a8df7d64e3540bdbf66cc589e0628cf.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_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 5292 bytes
SHA-256: cf5ceb54604f2cddb94f70ac45558b3a480004b72f11a91787d1b4b0b826b88a
font_01_sfnt_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 11008 bytes
SHA-256: af24b3c1eb5c0f4149084e858a50824f81c5eb95639e7ecd0be2d6cd397d7dca

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