Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c86a69f0eb7890…

MALICIOUS

PDF

78.9 KB Created: 2021-02-13 08:35:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e232c002b58bea8d956118b1395c1df8 SHA-1: 36a37ad6a12f06790092398271730e072a4b2f76 SHA-256: c5c86a69f0eb7890d815fdcac28305a76194da7fc1378dfd457119b8605be1a6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=types+of+spiders+in+oregon PDF link annotation
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/c0c324560296b3.pdfIn PDF document text
    • http://whitecheat.xyz/candy_crush_saga_hack_toolfmzs6.pdfIn PDF document text
    • http://mandarin-fruit.space/electrochemistry_worksheet_dr._lara_baxleyc76pj.pdfIn PDF document text
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/07eeded.pdfIn PDF document text
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/4325764.pdfIn PDF document text
    • http://ontrade.top/votejeni3bd9u.pdfIn PDF document text
    • http://xezosejosofof.iblogger.org/96860316217.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/fbd004b5e1c.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/2416528.pdfIn PDF document text
    • https://zutafemaz.weebly.com/uploads/1/3/4/4/134478566/zubigiluzat-xelubajubew-kixakeguboma.pdfIn PDF document text
    • http://sibivelemeruzu.iblogger.org/australian_national_superannuation_scheme_annual_report.pdfIn PDF document text
    • http://medtechnika1.ru/kudavazikokumivenunivado9twof.pdfIn PDF document text
    • http://gifozazupu.iblogger.org/vokusotatefapu.pdfIn PDF document text
    • https://sujoxiwu.weebly.com/uploads/1/3/4/8/134879933/zozunozi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/savifin/chrome_app_android_emulator.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/jurezenapotiwas.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/chat_spin_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/cibil_cmr_full_form.pdfIn PDF document text
    • http://xirasajizobopa.rf.gd/76386278009.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_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 4728 bytes
SHA-256: aa0d82e61ca87024a66e5e20e1229375fed67b561631d372cd24342b39f485cd
font_01_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 10240 bytes
SHA-256: 506c98477563ffa1af6bfdaeff9ae2c4a8b53ec820c9d231f226db9e2bc684cc
font_02_sfnt_off0001206c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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