Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f3a6edbe64bcfd…

MALICIOUS

PDF

73.8 KB Created: 2021-02-20 07:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 438d7fd1d657ab913bb5e2a625999545 SHA-1: 4ed9f5a2f1e910c69cf766328c9d7bf29ce43006 SHA-256: e4f3a6edbe64bcfdf5ae68055bb7acbd698af1a37bf5d6d0a2e6c5ac5e162c42
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous links to external PDF files hosted on disposable domains. One of the primary links directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain keywords related to printer problems, suggesting a lure to trick users into clicking malicious links. No scripts were extracted, but the presence of malicious links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=hp+laserjet+p2035n+printing+problems In PDF document text
    • https://static.s123-cdn-static.com/uploads/4417208/normal_5ff4cfdd8920a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463560/normal_602b2bce6e9f0.pdfIn PDF document text
    • https://wudegilunukoga.weebly.com/uploads/1/3/1/3/131379548/xogaw_gafovisezonib_wagusikilobil.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/jeRihfi/bemewulazobefozira.pdfIn PDF document text
    • https://cdn.sqhk.co/kamugututu/iggjfla/dekozawupiwoju.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/n31Zmib/vulobirelamoruruxux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415944/normal_601e57f1dbeaf.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/5jh2qjj/dopaxorupemisofowinini.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/s4iaAgf/xavizorarudajavewuwiwan.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/hmq2hc3/futezamodige.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482415/normal_5fe2f353c92dc.pdfIn PDF document text
    • http://mosasekoz.22web.org/35269706480.pdfIn PDF document text
    • https://neritakewu.weebly.com/uploads/1/3/1/8/131856632/ludodewid.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/FCSCXhb/grand_truck_simulator_2_map_editor.pdfIn PDF document text
    • https://wepoduxusuduxi.weebly.com/uploads/1/3/4/3/134306179/919808.pdfIn PDF document text
    • https://cdn.sqhk.co/fozuwasixeja/g4hcyPJ/my_club_app_pakistan.pdfIn PDF document text
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/banapopokak-gavop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484169/normal_602eb61ca3eea.pdfIn PDF document text
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/b6d6296193.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 5876 bytes
SHA-256: 5114e3ebb7dedd3e4850349940da6cd8e099310fe707761a33a29fd7cd8e98cf
font_01_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 10732 bytes
SHA-256: 096d598e56254c567ef18c20896b8d27acf65af5de137c290c4bd67a5e6aa16a