Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a4fa37c6e120ad…

MALICIOUS

PDF

77.7 KB Created: 2020-11-14 01:09:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7e87388c6c198530b5fd5320655adbbf SHA-1: 9816653006725db9ba9c1ace429cc03f7e211fa2 SHA-256: 31a4fa37c6e120adaabcd27e25e5e6998465295d9f28224ecf7474fdafbafae3
214 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The heuristic firings indicate it's a malicious redirector and part of a link farm, suggesting an attempt to drive traffic to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign disguised as search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffmen.ru/strik?utm_term=glencoe+algebra+2+3-2+practice+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_5f92e5d029d5f.pdfIn PDF document text
    • https://fububekamuko.weebly.com/uploads/1/3/3/9/133986391/lesavikumebovoli.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/1249403.pdfIn PDF document text
    • https://punuvenow.weebly.com/uploads/1/3/4/4/134445800/wixofe-fedesemix.pdfIn PDF document text
    • https://pefopurez.weebly.com/uploads/1/3/4/3/134375846/tumofoburek.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/dbbb9fc1fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_5f8d55c3b36e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/zetirikuvexezefowejibeb.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/tibolitosifosubosopiwiru.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/like_water_for_chocolate_nytimes.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/aapcc_annual_report_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/vizio_razor_led_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/the_18th_brumaire_of_louis_napoleon.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/gta_v_mod_menu_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/yowhatsapp_apk_download_2019.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD946 5692 bytes
SHA-256: 21d7bf281a0a455ffbc367d808df93f5fdaf1cb7a1af087fd7759c3d863cf996
font_01_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 11520 bytes
SHA-256: c4739fa5545abd312aefd384471220f567fda8f308ffd1f616367deff1f9e433
font_02_sfnt_off0001147c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147C 16092 bytes
SHA-256: f12998e4de2c4add16154aa3061da321808f144478938a8e5b2a68716cc9751c

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