Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0f570c17c63549…

MALICIOUS

PDF

90.3 KB Created: 2021-02-24 03:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6a9af46d35e5b08478ff739cc8a2d313 SHA-1: 23042c318400066a5cea0892f729cd65a155c189 SHA-256: 3a0f570c17c63549cea9485b8ea8713dcec4301c7950bc4c31600890331cd00b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/strik?utm_term=the+things+they+carried+quotes+about+fear PDF link annotation
    • http://fepemewavitik.66ghz.com/college_algebra_questions_and_solutions.pdfIn PDF document text
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/vazanomevo.pdfIn PDF document text
    • https://cdn.sqhk.co/lenufetimop/jcnghic/iphone_11_pro_max_lock_screen_wallpaper_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fixijolexap/icgj7Ir/national_boss_day_the_office.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/Yjbjjgi/jet_balloon_macy_s.pdfIn PDF document text
    • http://pasasem.iblogger.org/kedoxamozatetag.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/jhHgjLB/woodworking_guide_ffxi.pdfIn PDF document text
    • https://cdn.sqhk.co/tedefoso/Gnmibgc/vupef.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/giegfib/pimob.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/5gdgfhj/uefa_champions_league_results_2020_21.pdfIn PDF document text
    • https://buvonumonub.weebly.com/uploads/1/3/5/3/135304713/jurixizav-degosezifivaga-juzidonusa-xonememedujugi.pdfIn PDF document text
    • https://worojipe.weebly.com/uploads/1/3/1/3/131382243/mejosadijavuborekiso.pdfIn PDF document text
    • http://petajofap.22web.org/las_auxinas.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
    • http://zisajas.epizy.com/laworoki.pdfIn PDF document text
    • http://dizojid.rf.gd/50181289762.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/assamese_serial_ardhangini_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/alesis_dm6_assembly_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/noxorowib.pdfIn PDF document text
    • http://gurevome.rf.gd/manual_gopro_hero_3_silver_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/lotesafafuviniv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 5452 bytes
SHA-256: ff1e7c8d9d9fa8a1d30e37ed7532d84c4f7f67b3e67f0adac2335a2d58750b03
font_01_sfnt_off000111ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EF 11032 bytes
SHA-256: c0707e847b66f7759d07da7b9e63796cc7a5d8eb7b3664a5bb87fecbed0107bc
font_02_sfnt_off0001379d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379D 16148 bytes
SHA-256: aabbb95e4258a1bccfe6759090a0a8b97a33e8154131110566ffb2eaa8fdb080
font_03_sfnt_off00014c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C93 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e