Malicious PDF — malware analysis report

Static analysis result for SHA-256 420e0c56d410fd41…

MALICIOUS

PDF

85.2 KB Created: 2021-02-09 18:18:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 5633976aa4b4b7baa48c7e3a6b83d01a SHA-1: 86c9717b815d85e1dd3f6e64c1c900bec1eac82c SHA-256: 420e0c56d410fd4175a91564cfa2fe24c58feaf64042f2d70ae368f1f72305ad
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a prominent one pointing to 'maypoin.ru', flagged by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/aws?utm_term=arnesby+school+uniform PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501777/normal_6018ea9248631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414489/normal_6015aea516783.pdfIn PDF document text
    • http://copyrightshelpcenter.com/doxuzifezixizewululetuzi6xjd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5ff4901623e14.pdfIn PDF document text
    • http://betmoy54.com/68594387074kejuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_5fd9164bec6e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463528/normal_600a74cc9be86.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/magakoguwazedilijotarokjtpby.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367268/normal_5ff283842613e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466411/normal_60121448a358c.pdfIn PDF document text
    • http://yognat.space/vetiwekifivikezybtv.pdfIn PDF document text
    • http://vittorguxx.site/bmw_k1200lt_owners_manual_free_download9vm79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_6015b47f11613.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420775/normal_5fc8a346732b8.pdfIn PDF document text
    • http://iwhite.space/plural_nouns_worksheet_for_grade_29beq1.pdfIn PDF document text
    • http://latuha.com/mamimejop0xonh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wezukep/aadhar_card_number_se_aadhar_card.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/nulufeloj.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/herbal_medicine_for_arthritis.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_off00010f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3E 5140 bytes
SHA-256: f97fad7173018ec5aa94339c656642e8684cdbb80ef71b7a86b3e9aa442d7951
font_01_sfnt_off0001209f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 11464 bytes
SHA-256: ce425aafa545521d8c176f8e7a97a2db001c544548cdf7f4217b070860e09b72

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