Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f890d3d9d4d0460…

MALICIOUS

PDF

90.1 KB Created: 2021-02-26 12:17:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 58b27b0f1c81ddf8d0404622bcb43dde SHA-1: a617eea9f46da1c05afd60d7041ee1392d6badac SHA-256: 8f890d3d9d4d04600a3258c43dd9349e83f867fca6ad9f81c3741d1c28d10f05
244 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains or known malicious redirectors. The document body, though heavily obfuscated, suggests a lure related to calculus problems, likely to trick users into clicking malicious links. The presence of multiple PDF link farms and a critical ClamAV detection for 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/123?utm_term=definite+integral+calculus+problems+with+solutions In PDF document text
    • https://titoboxe.weebly.com/uploads/1/3/0/8/130874676/kinunuget.pdfIn PDF document text
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/034442d4a.pdfIn PDF document text
    • https://siwepuxerit.weebly.com/uploads/1/3/0/7/130775843/2555144.pdfIn PDF document text
    • http://dajinanumiki.iblogger.org/avengers_2012_movie_in_tamil.pdfIn PDF document text
    • https://dixufewopirar.weebly.com/uploads/1/3/0/7/130775961/kenoxekiwiv.pdfIn PDF document text
    • http://mmuuue.space/bigg_boss_3_tamil_promo_today8xs1u.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/punusa-vezenigefa-zegemik.pdfIn PDF document text
    • http://petersikdar.com/20399024923h80m3.pdfIn PDF document text
    • http://kulixebuvalafin.iblogger.org/mofatalesikonitaba.pdfIn PDF document text
    • https://xavamukunakupa.weebly.com/uploads/1/3/1/4/131437969/9696050.pdfIn PDF document text
    • http://hookup666.site/burnaware_free_32_bitvk0uo.pdfIn PDF document text
    • http://smilex.club/windows_10_version_1809_iso_files3p4m0.pdfIn PDF document text
    • http://mybiol.site/nikon_p_223_4_12x40_manuale27xg.pdfIn PDF document text
    • https://mamumudud.weebly.com/uploads/1/3/0/8/130814078/xuwijoru_xaviladikav_vutelosaw_gugupiz.pdfIn PDF document text
    • https://kefavobora.weebly.com/uploads/1/3/6/0/136010588/bupetil-masafiwo-vebasiparexed-zilanu.pdfIn PDF document text
    • http://pixelbarista.com/are_formula_1_cars_faster_than_formula_e3zvc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/numegubowalonan/vovibusofazajiwowew.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/fubisufuwewogaliru.pdfIn PDF document text
    • http://tasefabomodewiv.epizy.com/jusarezewofojak.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/63853125800.pdfIn PDF document text
    • http://tokumizexafu.epizy.com/20637088776.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 5540 bytes
SHA-256: 57db873309224aac6cc55a1a2ecf7be887a9cab962057887664601fbb9d8b99c
font_01_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 12720 bytes
SHA-256: cc8d160477d8acf189217b9f64f5ca7b0811306603b67dda31a8dc8a548b177f
font_02_sfnt_off00014c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2