Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7d718b51415804…

MALICIOUS

PDF

78.0 KB Created: 2021-02-27 02:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 599c9fad1145f6b4379a5fc3e6db4c4a SHA-1: 99b8dd245c1c9ccce931e2b2d3167d3952dfdf33 SHA-256: bd7d718b5141580488fa0b2f71f26d876d954ba7386f718bc098cf9179367e66
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and Weebly hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

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
  • 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://midufefew.ru/wix?keyword=how+to+write+a+similarity+statement+for+right+triangles PDF link annotation
    • https://ripufimavewin.weebly.com/uploads/1/3/6/0/136099474/242695.pdfIn PDF document text
    • http://vogeposekuxav.66ghz.com/17082700800.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/45364701337.pdfIn PDF document text
    • https://fixasamajiwige.weebly.com/uploads/1/3/4/3/134318971/wexesunasiwovo.pdfIn PDF document text
    • http://digovin.getenjoyment.net/engineering_mathematics_online_classes.pdfIn PDF document text
    • http://wezugeviliwibu.iblogger.org/point_slope_form_math_is_fun.pdfIn PDF document text
    • https://lanokonemuke.weebly.com/uploads/1/3/5/3/135309959/tesomemopokawa-xajibagoroxi-muviwusogo.pdfIn PDF document text
    • http://lalozakuren.66ghz.com/bse_midcap_index_performance.pdfIn PDF document text
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/bosofu-dimijilowiz.pdfIn PDF document text
    • https://fevonijapa.weebly.com/uploads/1/3/4/2/134234837/fusazuboz_mawamewolizoba_bujinese_zuduzalum.pdfIn PDF document text
    • https://vupixesit.weebly.com/uploads/1/3/2/7/132740805/wovoximuku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wojibikifi.myartsonline.com/leather_knife_sheath_patterns.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/how_long_should_a_front_load_washing_machine_last.pdfIn PDF document text
    • http://zarazemudaseri.epizy.com/63154116014.pdfIn PDF document text
    • http://vogafaxusa.epizy.com/what_gender_is_simbas_child.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_off0000df09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 5336 bytes
SHA-256: a2debd7fdc6a952bb989bb1f0e7af57337bee1924958a42f2e24bbab18897421
font_01_sfnt_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 10212 bytes
SHA-256: 79ed7cad33d1c34b1d90b3c38089dcf767b81b229b8cbc747ece8e082bc375ec
font_02_sfnt_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 16328 bytes
SHA-256: fc3f3f27b9d1836171e95cc93a925d531c0ea8fc3ed0db0406aad0dcb44ca772

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