Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fc89c4da524523…

MALICIOUS

PDF

88.1 KB Created: 2021-03-15 23:55:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5acb4ffea393f54652c25a8fc5b18aab SHA-1: 5ba00bb22ff27cbd853a2f1bcc97fed564369bd3 SHA-256: 18fc89c4da524523ae27e97732179a48238926075d3e2d302eaf483867a1901a
246 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://makezuxakoje.weebly.com/uploads/1/3/0/7/130739015/narijo.pdf.
  • 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://maypoin.ru/wix?keyword=teacup+maltese+puppies+for+sale+in+kentucky PDF link annotation
    • https://makezuxakoje.weebly.com/uploads/1/3/0/7/130739015/narijo.pdfIn PDF document text
    • https://gobezovix.weebly.com/uploads/1/3/1/4/131454522/62a900ae4.pdfIn PDF document text
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/sulirokidetutupanet.pdfIn PDF document text
    • https://xuvasilibozin.weebly.com/uploads/1/3/5/3/135335949/towepovujaxelefepoxi.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/98357592921.pdfIn PDF document text
    • https://fufarolobol.weebly.com/uploads/1/3/4/5/134597676/degowuk.pdfIn PDF document text
    • https://vodunifowabot.weebly.com/uploads/1/3/5/9/135992931/soluzor.pdfIn PDF document text
    • http://kekijojovif.sportsontheweb.net/18325168837.pdfIn PDF document text
    • https://vepimogarib.weebly.com/uploads/1/3/4/8/134856589/4967006.pdfIn PDF document text
    • https://revasarubon.weebly.com/uploads/1/3/5/2/135295272/5638609.pdfIn PDF document text
    • https://nusutena.weebly.com/uploads/1/3/0/7/130739474/zipuxape-ramumepavu-paxumoson-tenuwelote.pdfIn PDF document text
    • https://xuvelusikifaza.weebly.com/uploads/1/3/1/4/131406656/dca0595.pdfIn PDF document text
    • https://ketezujozak.weebly.com/uploads/1/3/4/7/134744557/wevuxupib-popelow-sozima-potememug.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/eccfd0b1-d031-4399-8417-6a82d026256e/5317127884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac73e377-cc5a-4d6b-a4c6-5c63b584f399/is_calcium_nitrite_ionic_or_covalent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7203eb6e-7eca-4ef4-bce8-f46b5fa38b17/51490611464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42df701b-0b35-4ec2-a497-3649ed56f3da/soundcraft_ui12_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2147d9e-edf3-46ff-b94f-535ae2380383/verbos_regulares_e_irregulares_en_ingles_espaol.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11910 5276 bytes
SHA-256: fe8671686a58bc224aaeb2cf41f55e0f3126f6715f16a057cb4a425ae28a42ae
font_01_sfnt_off00012af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 11912 bytes
SHA-256: f216472bfcc4d6633c7dbfae9b9752c3cf2a0633abb46040022f4be88fefc54c