Malicious PDF — malware analysis report

Static analysis result for SHA-256 c479e6a622e8c865…

MALICIOUS

PDF

86.2 KB Created: 2021-03-06 13:43:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2d133675956bca6589412c019c9b9843 SHA-1: 7293a2eb4b62d982cc8bb19f10507e61e5f7e152 SHA-256: c479e6a622e8c865c1765b839c33ef9454aecd8e2249dee7da5b47618289e556
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO poisoning attack. The embedded content, though heavily obfuscated, suggests an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

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://lozipotod.ru/award?keyword=how+to+change+sharp+scientific+calculator+to+radians PDF link annotation
    • https://cdn.sqhk.co/feguzuvubut/ggMiaRP/e2_equalizer_hitch_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/xetilibul/jcEjfhb/75699081631.pdfIn PDF document text
    • http://masovizifuzaro.iblogger.org/xetafowumepalawejafur.pdfIn PDF document text
    • https://jiranunurojowoz.weebly.com/uploads/1/3/1/8/131860868/aad06e5e.pdfIn PDF document text
    • https://moxiwomalupul.weebly.com/uploads/1/3/4/5/134598527/778ca9e34b.pdfIn PDF document text
    • https://roguraluvi.weebly.com/uploads/1/3/0/7/130776180/luniweke.pdfIn PDF document text
    • https://xogukozatakik.weebly.com/uploads/1/3/1/4/131453421/5e80b5d8.pdfIn PDF document text
    • https://rujizubag.weebly.com/uploads/1/3/0/7/130776042/gizafelemijit.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/3441d1.pdfIn PDF document text
    • https://lososegumupabi.weebly.com/uploads/1/3/1/4/131407698/wokanujujif-wusirejakolok-towakirulibe-kenefaxatazit.pdfIn PDF document text
    • https://wutaleba.weebly.com/uploads/1/3/5/3/135390467/5492710.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bakavifotegenol.epizy.com/business_card_design_cdr_file.pdfIn PDF document text
    • http://zinaguj.epizy.com/1st_grade_math_worksheets_games.pdfIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_edf0f389b3d94db6b4c397e2b6e94a83.pdf?index=trueIn PDF document text
    • http://vamudeb.epizy.com/gepijekirolor.pdfIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_5146491b203b41dea7c8c2deff34d647.pdf?index=trueIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_a1e150190d6249bfaccda96951062dc9.pdf?index=trueIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_008e139967cb4f30b7c68cca27f0478f.pdf?index=trueIn PDF document text
    • http://sewepara.epizy.com/rumugopesez.pdfIn PDF document text
    • http://wexewowi.rf.gd/bluffers_guide_to_entertaining.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_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 5468 bytes
SHA-256: 61a5d42bd1170cab8d6c3f2ed58f2714b572a5c1c9b864e83fac35f667178a7d
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 15276 bytes
SHA-256: ee3ab7b75b74e15a13d79f7f180e797374eb628d0282110c383cb38a372ecaae
font_02_sfnt_off00013581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13581 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e