Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a944e3040fdcfb…

MALICIOUS

PDF

77.5 KB Created: 2021-05-21 13:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 345e08bb1fba248fd4c3bf276f5a46a0 SHA-1: e7c98f4a3d6358df2f951f909256acbb55678fb3 SHA-256: 27a944e3040fdcfb0d9d6bfdcf4047779bd7366e56a33ad469b36c4fe5491de3
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The primary URL, 'https://maypoin.ru/strik?utm_term=how+do+you+reset+a+taylor+lithium+scale', appears to be part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://maypoin.ru/strik?utm_term=how+do+you+reset+a+taylor+lithium+scale PDF link annotation
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/a3a1629a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459328/normal_6009c49f08466.pdfIn PDF document text
    • https://jubigugatuse.weebly.com/uploads/1/3/0/7/130775741/mevofanuze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450426/normal_5ff41a456c3dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393763/normal_6006a15bb2f30.pdfIn PDF document text
    • https://xikofekukinakij.weebly.com/uploads/1/3/2/6/132681309/902055.pdfIn PDF document text
    • https://raxuzorozejataw.weebly.com/uploads/1/3/4/0/134042373/wamizazibogo.pdfIn PDF document text
    • https://veregatuvodomos.weebly.com/uploads/1/3/3/9/133997599/xakiwubavudegilu.pdfIn PDF document text
    • https://likufuzojelawaf.weebly.com/uploads/1/3/5/2/135298946/4a92fecde662540.pdfIn PDF document text
    • https://mozevosiku.weebly.com/uploads/1/3/3/9/133999333/4820334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502436/normal_6051f075d49e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410714/normal_6029c88ff26f5.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/73703689-b497-4887-8241-a71063fa7128/washington_post_digital_subscription_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68887dfe-84c5-46a7-becf-3da75dc527b5/active_and_passive_voice_activities_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f00b08-8c72-4ca0-9eb9-3ba2a0964662/56827522808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9934cd-b8f9-4be6-8a32-1c2ada6ee417/zijimezidavutof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a15bb73-b306-460c-8ba4-5b0197d3e5d8/68286269264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d01197b-c6e9-43f9-8178-e10eed41eea8/revatonexivebugal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c2eed03-b304-4954-860a-7284c7483f7a/59198791746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b55df0d-f6d4-4722-bac6-c0ca8d52378f/who_does_amelia_bedelia_work_for.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_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 5336 bytes
SHA-256: 93a36ad91b84912b99f60ea916ab218cb783776a2cf864f22ef544060cab79ef
font_01_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 11300 bytes
SHA-256: 55156ac6339cc842e1aac69ee4a27c6a4c2e6920e2c9738d7a6946576ade182d