Malicious PDF — malware analysis report

Static analysis result for SHA-256 5727dd9e65d2ab43…

MALICIOUS

PDF

318.4 KB Created: 2021-04-06 17:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ef7944c986372d3dc09a627627848ca7 SHA-1: b9ea0b621953ad5069efb5d3a5b630f7bd4de0fb SHA-256: 5727dd9e65d2ab436d0541d6a9b50f17eb7f0bed404b01926f4a801295ac39ad
136 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. The document body, though heavily obfuscated, contains text related to 'bomberos de chile' and the authoring application 'wkhtmltopdf', suggesting a lure. The primary IOC is an external URI pointing to a suspicious domain, likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9695

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://xajibur.ru/123?utm_term=informacion+sobre+bomberos+de+chile PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370066/normal_600edd914cd41.pdfIn PDF document text
    • http://azakalaza5.xyz/sat_math_practice_booky8z7c.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/9vificU/yankee_doodle_keyboard_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/blank_times_tables_worksheets_1-12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_5fd8ddf6e42d6.pdfIn PDF document text
    • https://bopisigo.weebly.com/uploads/1/3/1/4/131453919/8c9a35e136412d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388813/normal_6039685518a2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498882/normal_5fcc4ce3c4f6b.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/affinits_lectives_goethe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468572/normal_60464978283e5.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/zaxaboxosaneb-peverinafefezut-pasufabefiz.pdfIn PDF document text
    • https://cdn.sqhk.co/pinufizugal/gcIUgh7/lakinojorevepizekox.pdfIn PDF document text
    • http://everydays.space/call_of_duty_update_time5iuim.pdfIn PDF document text
    • https://kexibisurek.weebly.com/uploads/1/3/4/3/134334279/mevefakunotul.pdfIn PDF document text
    • https://cdn.sqhk.co/dasulujina/aQPoicw/sojujeligodofopu.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/6620f5b5-1d4b-4f26-a63a-30c0610129a6/gofatedawax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abac4c4e-326b-456d-bf6d-9b527440e2fb/fozun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dada7091-e03e-438a-b9b0-93425e06e284/ziwovebofinusibisapates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13790a2e-36eb-444e-a3ff-dd309f733704/33424524035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03928346-06b0-4f8b-8581-2c886cde53e1/volumabipapapakoburitasol.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00048513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48513 5340 bytes
SHA-256: 6b241ee0a66bb5364d4758c23c37bd96a4088dd1285cd2609e9180ab0a318999
font_01_sfnt_off000496ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x496FF 1852 bytes
SHA-256: cefa93ab99268b9387626336cc8aeb986d802f3a091f6156c231f0642977bfab
font_02_sfnt_off00049fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49FDA 16860 bytes
SHA-256: 848b9abaecc0e0f94aad7857f6aa9f4c802d54e5327e817072d0d3458c0bf324
font_03_sfnt_off0004d247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D247 16436 bytes
SHA-256: be42612503beb0021a8f9dcfffb448ff08b5dcf845a91b068d1fe5ac07c3c2a9