Malicious PDF — malware analysis report

Static analysis result for SHA-256 14fce1f826fb39cf…

MALICIOUS

PDF

80.4 KB Created: 2021-03-01 14:36:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bbc1e9d0496ec6cd4198518900154e75 SHA-1: 2855dded02bd645b6796075aca61be63d5e908ce SHA-256: 14fce1f826fb39cfb726524d838112a33d8fe45b7800bb8732c6761293d01ce6
226 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this. The ML classifier and ClamAV detection confirm malicious intent, with the latter identifying it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains what appears to be a search query, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://mezovuduw.ru/wix?keyword=algebra+2+chapter+2+functions+equations+and+graphs+answers PDF link annotation
    • http://mitutepoka.medianewsonline.com/rem_1187_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_602bad59708e1.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/zibibid/bmobile_png_promotions.pdfIn PDF document text
    • https://cdn.sqhk.co/xanuramalu/fi0iigP/war_in_pocket_hack_apk_2019.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/gopro_hero3_black_edition_default_wifi_password.pdfIn PDF document text
    • https://cdn.sqhk.co/woravejafeto/jA6ia8E/xufibanokevowugagesi.pdfIn PDF document text
    • https://livakazogoje.weebly.com/uploads/1/3/4/6/134622539/ronun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527859/normal_600087d26f843.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/xileruro.pdfIn PDF document text
    • https://cdn.sqhk.co/zubejavaxuvu/yywiihj/dujubifobikezavad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384640/normal_6001017326e29.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/3iciehe/lujalovo.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/8782106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480598/normal_60297dca57337.pdfIn PDF document text
    • https://cdn.sqhk.co/lasijutag/jegiQYY/72401_zip_code_location.pdfIn PDF document text
    • https://cdn.sqhk.co/bomagomax/mhjOgc7/kitchen_family_style_cast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wexefopaled.rf.gd/19778766771.pdfIn PDF document text
    • http://tujiritam.epizy.com/commandos_like_game_android.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_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 5896 bytes
SHA-256: 636fdd76cff13170454571d714320b6bb0c9edb7dbe07bc0a2526c4825bc683b
font_01_sfnt_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 11356 bytes
SHA-256: 3cf40233afd14afd1cee591c4db60451a54c72a6ef3d49d245c028ebb956ed1d
font_02_sfnt_off00011df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF4 16140 bytes
SHA-256: 07bdd4d7aeb86dbe9534c18cdeef2e0dc6abb6c74c56eef6bb1e21193f7e9fa7