Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d002ca22fa76d7…

MALICIOUS

PDF

71.9 KB Created: 2021-02-20 02:58:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a32b595b8da806d0998f422ad374bb6f SHA-1: c9380be57f2c508499e05cc3060c1231ba8d5afb SHA-256: 37d002ca22fa76d7d125b2aaf5651156f4d2a72e8accd4c64fe489e8344675cd
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an external URI pointing to 'baarspo.ru', which is likely part of a phishing or scam campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to redirect users through multiple disposable hosts, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=how+to+walking+bass+piano PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5ff2b10eef270.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411935/normal_5ff3ba7dd7828.pdfIn PDF document text
    • http://martans.space/60682299164m7m5t.pdfIn PDF document text
    • https://nonibebufixaz.weebly.com/uploads/1/3/2/6/132682934/pusolewijurenomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_602f114cadb23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408981/normal_600a6980bae4c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pafovipazatuk.rf.gd/51865339875.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/when_to_grit.pdfIn PDF document text
    • http://pikezega.epizy.com/177_mental_toughness_secrets_of_the_world_class_barnes_and_noble.pdfIn PDF document text
    • http://porininiji.epizy.com/ap_psychology_notes.pdfIn PDF document text
    • http://karifopiti.epizy.com/40464125204.pdfIn PDF document text
    • http://ziwufuv.rf.gd/attahiyat_malayalam.pdfIn PDF document text
    • http://badizep.epizy.com/contemplate_doing_definition.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_off0000ddd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 5148 bytes
SHA-256: f22775851d279734cfbdd8864e2faf691ee392d56bea7606d07032b3be230cd0
font_01_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 10636 bytes
SHA-256: 86786b90a3b8e0a6437e248dce5ffa6eb697900c322a0d4622c6c0c6c48de2a1

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