Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e2e88946b0f35f…

MALICIOUS

PDF

65.5 KB Created: 2021-02-14 16:13:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6d655a99080861bea2e3ddb2abae1a54 SHA-1: 5b3f0d878b5fd5d10162c237f517115b8d3c587d SHA-256: c8e2e88946b0f35f1a4ae02bfeed8fab045686687c0ae8530938f69f79c1f641
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=surgi-sharp+universal+angle+guide+ss10 PDF link annotation
    • http://findssldz.xyz/principales_causas_del_cambio_climaticov2vbp.pdfIn PDF document text
    • http://topmassage.net/iec_60617_electrical_symbolsojy19.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/SgebDD2/car_disassembly_3d_mod.pdfIn PDF document text
    • http://legrand-spb.ru/bibomitowy809j.pdfIn PDF document text
    • http://guitar.su/beholder_monster_manual_5edk4ho.pdfIn PDF document text
    • http://svarka-aurora.online/5445772398965unw.pdfIn PDF document text
    • http://top-shop-store.website/57509513950i5udo.pdfIn PDF document text
    • http://mantenancie.com/razer_huntsman_miniiees0.pdfIn PDF document text
    • http://homearfes.com/google_authenticator_manual_key_formatu4ruc.pdfIn PDF document text
    • http://tivewuba.iblogger.org/telenor_autogiro.pdfIn PDF document text
    • http://kosodidaxelo.22web.org/bonamosaturoralovo.pdfIn PDF document text
    • https://cdn.sqhk.co/fufigavaki/Ngdjegi/sodakigaza.pdfIn PDF document text
    • http://vquest.website/mazelodejuvms8i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tifilumiteva.epizy.com/informative_poster_template_free.pdfIn PDF document text
    • http://fasasipapuzu.rf.gd/lake_gaston_nc_fishing_guides.pdfIn PDF document text
    • http://kepujelibip.epizy.com/akkada_abbai_ikkada_ammayi_naa_songs.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_off0000c14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14C 5612 bytes
SHA-256: 947111b73e97661b0dc27e3b39ceadad3974b66362e9140bf1f0c9bd2e23f915
font_01_sfnt_off0000d46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 10792 bytes
SHA-256: 3c015316fded34e1918199cb43672a94d5ffccf2cb700799a7ee131dcb466806

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