Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aabeffaa97cbe1b…

MALICIOUS

PDF

85.8 KB Created: 2021-04-05 06:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8cd1deeecb264535882ebb7aff15e356 SHA-1: 4d787124bbe20ade5edfd158712c342c62df0254 SHA-256: 1aabeffaa97cbe1b08e149330aaf20ce55175a2794df382d00d78773f69bdf43
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links pointing to various external PDF files, indicating a link farm designed to direct users to potentially malicious content. The presence of a link to a known malicious redirector infrastructure further supports this. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for obfuscation or redirection, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://crophysi.ru/strik?utm_term=what+is+biological+processes+in+psychology In PDF document text
    • https://cdn.sqhk.co/pogadidotilu/1Mjfmjf/killshot_movie_streaming.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_600f0f561f1d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407084/normal_6046be1364d8c.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/YxMgghb/duvezapez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461205/normal_6006d961c29f4.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/ohihjhf/fufaromafazibewezitike.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/Zic53hc/dijanifoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_604d711723ba2.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/Qgf6hi3/anime_piano_magic_tiles_pop_music_2_online.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/clajdAD/23144847223.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415754/normal_5fcfe4ff8bedb.pdfIn PDF document text
    • https://cdn.sqhk.co/sidigodoga/igbzXge/pick_image_from_gallery_android_androidhive.pdfIn PDF document text
    • http://zekabivalejasaj.22web.org/risk_management_tools.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423145/normal_6056a7d4714bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420910/normal_605106a5eb862.pdfIn PDF document text
    • https://cdn.sqhk.co/lukulobu/RgjNjdG/wiwikolidolixoza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470017/normal_60564d66d5b8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500453/normal_602d59d486178.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_b46722c98afb43c3912e9acf318b7c05.pdf?index=trueIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_62ecca053dec4062b86e06252b1822fb.pdf?index=trueIn PDF document text
    • http://velumosak.epizy.com/wuwazaboxamamum.pdfIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_b1ced580271447e3ac90d1b5971331c3.pdf?index=trueIn PDF document text
    • http://fituxulilofe.epizy.com/ganukemomofelutino.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001104a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104A 5452 bytes
SHA-256: e1b59a67b220cc662b0ff58f835b838c6eebaddb54fde5038d6f9f1a37c041f9
font_01_sfnt_off000122e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E2 11548 bytes
SHA-256: ca249eca0c771b6732405310376d921be898e1f7d0e0b1f670c39530e9341f50