Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1a517fcc5d866c…

MALICIOUS

PDF

86.4 KB Created: 2021-03-01 11:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 86a27954692f194ce98b430abaab7b58 SHA-1: aef0c0355764f484685ab065cf638f5bc9f44ca2 SHA-256: 1b1a517fcc5d866c4693d61bb65f3715d14a798f52b54817fe51d30098d7d453
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful sites, aligning with spearphishing tactics.

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://druttle.ru/123?utm_term=is+gamecube+better+than+n64 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388598/normal_5fd608ed1a60d.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/lakoxubifikibunujatimerin.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/how_to_find_equivalent_ratios_khan_academygtg0m.pdfIn PDF document text
    • http://thecet.xyz/lupumudikibibiwedasidv7j.pdfIn PDF document text
    • http://retys.space/12358130624d933z.pdfIn PDF document text
    • http://brumbum6.xyz/54699382394cc5y9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448113/normal_5fdc431abff9d.pdfIn PDF document text
    • http://xtrading.buzz/zutemapusotevag1qky.pdfIn PDF document text
    • http://profibrend.ru/hydrological_cycle_worksheetvw3md.pdfIn PDF document text
    • http://bupetud.xyz/oscar_and_the_lady_in_pink_characters4ibxb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitasixan.atwebpages.com/90826546420.pdfIn PDF document text
    • http://tudutov.rf.gd/aashiqui_2_movie_720p_hd.pdfIn PDF document text
    • http://forawoxo.epizy.com/guzusevixidavez.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 3444 bytes
SHA-256: a392204187782a1e356bb7575a46077b91d86d6a416d79d9859b9d60bcaef606
font_01_sfnt_off0001130e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130E 5500 bytes
SHA-256: abd83c33ab74254c4221c7c3750cf6e2f3f2f79288c56f1c386848923e8f3e1d
font_02_sfnt_off000125a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A3 11384 bytes
SHA-256: 39dd0675257c6cc5ac20a81246d1be4f3f657922f7c3c24c10502fe88bc0a536