Malicious PDF — malware analysis report

Static analysis result for SHA-256 45df50bf01529207…

MALICIOUS

PDF

91.2 KB Created: 2021-02-27 10:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: edfdb19e99e3d6185a6ca7961b370ff5 SHA-1: 3dfc36acd4492fd2a24a7e0c114bb7487b0e0d3a SHA-256: 45df50bf01529207a366b6643e12facb7ee4f7eee3dea59bdab66e476515451c
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many pointing to disposable hosting or redirectors, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to educational materials, specifically an 'algebra 2 solving absolute value equations and inequalities worksheet answer key'. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/wix?keyword=algebra+2+solving+absolute+value+equations+and+inequalities+worksheet+answer+key In PDF document text
    • https://cdn.sqhk.co/gitovera/lVgfha3/39700451436.pdfIn PDF document text
    • https://cdn.sqhk.co/fanabezom/jg4hchh/26249822989.pdfIn PDF document text
    • https://tibilizam.weebly.com/uploads/1/3/0/7/130775373/kuxodupufolupon.pdfIn PDF document text
    • https://nuvefozilif.weebly.com/uploads/1/3/4/7/134733792/8089071.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/Igejhid/57902474225.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/logitech_z_640_wiring_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/ghjgdje/pulud.pdfIn PDF document text
    • https://fozaronu.weebly.com/uploads/1/3/5/3/135349809/6255442.pdfIn PDF document text
    • https://badetujunomut.weebly.com/uploads/1/3/1/8/131857650/f142172e0730727.pdfIn PDF document text
    • http://wukixijolori.iblogger.org/baaz_song_bhindranwale.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/hi9gcgd/79786627110.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/kovezodepugov/96511625968.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/english_comprehension_passages_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/nattamai_songs_in_tamil.pdfIn PDF document text
    • http://xuwedumod.epizy.com/adam_joan_song_whatsapp_status.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/boomkin_leveling_guide_bfa.pdfIn PDF document text
    • http://wepirizifomonij.epizy.com/arturo_perez_reverte_sidi.pdfIn PDF document text
    • http://gadabejevetel.epizy.com/17486901838.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/official_f1_calendar_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_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 5792 bytes
SHA-256: bfc8b8cfccb1dfeb0799043c4aa9595d29faf179465043847f84c35f84d772af
font_01_sfnt_off000116ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116ED 15900 bytes
SHA-256: 547b6176d93d31165d5ae0825b44750ff82e34e4103853803fa9f20c7dc172a4
font_02_sfnt_off000148d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D3 16112 bytes
SHA-256: bbb4928b2c5a50c0832ecd6ebb1362cd2d714bbe3e9ddae61164af3ebb87f482

Open this report in the interactive analyzer, or submit your own file for analysis.