Malicious PDF — malware analysis report

Static analysis result for SHA-256 056ff41df6e974ea…

MALICIOUS

PDF

85.1 KB Created: 2021-03-26 07:07:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 381e0da0b4e0bc58e5eb05a72ebaf13a SHA-1: d49b3a233874980adb699e370d70c090c693f997 SHA-256: 056ff41df6e974ea246c01894f3e80e1c6406f92c9a4c8854258858f6c1315d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URLs, 'https://seumenha.ru/wix?keyword=j+pop+boy+bands', is flagged as suspicious. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojan payload. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common vector for malicious PDFs to execute exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=j+pop+boy+bands
    • https://cdn.sqhk.co/vipatajase/egcgeIF/togixexomanivisisoj.pdf
    • https://cdn.sqhk.co/pefemezized/ihdijdi/resomupotepat.pdf
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/wizigu_nexipixotu.pdf
    • https://cdn.sqhk.co/bafebolabefo/jfieTjh/92732204075.pdf
    • https://vazonani.weebly.com/uploads/1/3/1/8/131871537/xiwemage.pdf
    • https://cdn.sqhk.co/fekurisakez/1pgegcy/fakonoseviva.pdf
    • https://bagobizofenagex.weebly.com/uploads/1/3/4/7/134767931/6913630.pdf
    • https://mokadipubozot.weebly.com/uploads/1/3/2/3/132303064/lirofalibufi-xofemobomatu-ridubul.pdf
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/jazubawosilaxe.pdf
    • https://cdn.sqhk.co/fovugemut/1gjGhbe/super_android_13_dokkan_medals.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_db5cf9541eb7436c942e3a99b7c9e7b6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f4e5d769-c42f-4aa1-bc0b-86cd1d89d7ac/getekadapo.pdf
    • https://uploads.strikinglycdn.com/files/728c5235-c135-410e-aec1-7fdd7b7af53a/padi_junior_open_water_diver_certification_upgrade.pdf
    • https://uploads.strikinglycdn.com/files/2bfea4d5-9b92-485f-9f84-2e91de2bacb7/diganefujawogok.pdf
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_666db398d7a94e7f9f332136bc67c78b.pdf?index=true
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_2146407203e04d1dafbfee5171fecb3c.pdf?index=true
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_84c68815a59941828ff543b19fdfc78c.pdf?index=true
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_8f6fe5845bc54a15860f67fffbff820e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8d921027-9801-428a-852a-ce08fd8fc3e5/facebook_help_desk_number_uk.pdf
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_33f504effdd04ed0b126b42fefdbc149.pdf?index=true
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_eb932665b2c64f3ab287b5467ff80189.pdf?index=true
    • https://uploads.strikinglycdn.com/files/09a30ea5-7253-43a7-93b4-9663a076c689/durebazawetovokib.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d8f.bin
d52a34ae0a05ee46da0628ca7673aecf0fa35dfdc6aad4c64d2ac459f78142b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 5056 bytes
font_01_sfnt_off00011ed2.bin
6d5949c0db0e1d059c61188e7311a82db4a0aac7bbd62f9e8d9951f30990ce9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 11916 bytes

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