Malicious PDF — malware analysis report

Static analysis result for SHA-256 d942f522d5eb5f56…

MALICIOUS

PDF

82.1 KB Created: 2021-02-12 21:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7f400982d660ea0d6d9a3fcbe5a98113 SHA-1: 8a04d7902bda563d0bfb97868b5b53f7234f0e15 SHA-256: d942f522d5eb5f56c9e083178f09aebdd182b96d9188fcfb0186389afb87aca1
226 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing or link farm attack, indicated by numerous external links, many hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://druttle.ru/123?utm_term=mr.+kelly+wants+to+know PDF link annotation
    • https://cdn.sqhk.co/zefipuvuwifi/glhi5ge/global_citizen_festival_2018_cassper_nyovest_full_performance.pdfIn PDF document text
    • https://xivogere.weebly.com/uploads/1/3/0/9/130969247/1575705.pdfIn PDF document text
    • https://cdn.sqhk.co/tojebaru/4GGVhh4/sivox.pdfIn PDF document text
    • http://rusakova.space/bowikiwemtdo8.pdfIn PDF document text
    • http://profaudit32.ru/12980055136r48cp.pdfIn PDF document text
    • http://shoop-fo.ru/wejorofuwigewolewgwnj7.pdfIn PDF document text
    • http://imm-shoes2.club/lexoj2jcz0.pdfIn PDF document text
    • http://kataeta.club/33734171766geilj.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/1vgiFED/hide_and_seek_game_online_multiplayer_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/fasgdr2/50771240719.pdfIn PDF document text
    • http://tevfikyuce.xyz/fiche_de_conjugaisongio9o.pdfIn PDF document text
    • https://fedalovojuxunod.weebly.com/uploads/1/3/0/7/130775560/dusajakumowu.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/9jQFagi/zinuradipajazivi.pdfIn PDF document text
    • http://topmassage.net/zuwubig7t5g2.pdfIn PDF document text
    • https://vinunawamezod.weebly.com/uploads/1/3/1/3/131380031/98740.pdfIn PDF document text
    • http://ellmax-site.xyz/8316551918fl6gz.pdfIn PDF document text
    • https://wulodegekejiwa.weebly.com/uploads/1/3/4/2/134266030/rukavedebibo.pdfIn PDF document text
    • http://managerprogram.live/event_marketing_plan_template_freea2bpj.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/XoGHwhj/92140826945.pdfIn PDF document text
    • http://cosmostil.top/97307172799g68n2.pdfIn PDF document text
    • http://infokurs.design/45487689159i9k0k.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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 2960 bytes
SHA-256: 3c6502e04658d985b37ed967139d4b1bb7136c1c8ff06868e6b64c17630b7d50
font_01_sfnt_off0000f7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 4712 bytes
SHA-256: 944f91b8f2df91fc84182277e85382011717ab24868cfc560ef8429cb3975f55
font_02_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 10792 bytes
SHA-256: 5ef621a8744339237bce34bf43e47e4ebc906dd76f4fd7851dbd6b7771ba25c1
font_03_sfnt_off00012c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C54 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378