Malicious PDF — malware analysis report

Static analysis result for SHA-256 4830228c39c8c9df…

MALICIOUS

PDF

79.9 KB Created: 2021-03-11 23:19:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: dc71fa699a03d714cd3064675af2cf73 SHA-1: 6ec740986b3eeaf4be006b575c8fb0c9ff64e5f9 SHA-256: 4830228c39c8c9dfca18cb688e49d64a00e76db68b8f809cca7729f3dda9233a
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, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=deca+stock+market+game+reddit PDF link annotation
    • https://pakipuxis.weebly.com/uploads/1/3/5/3/135347710/pudubokubige.pdfIn PDF document text
    • https://kawotubizon.weebly.com/uploads/1/3/1/8/131871780/jukotafagi.pdfIn PDF document text
    • https://pemejelusapi.weebly.com/uploads/1/3/1/3/131398576/pogekesexesi-kogejoporeg.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/dbjihfV/i_c_e_cream_online_delivery.pdfIn PDF document text
    • https://zekufizow.weebly.com/uploads/1/3/0/7/130775694/3371574.pdfIn PDF document text
    • https://rokipidofavum.weebly.com/uploads/1/3/4/0/134042790/xotul_saridunuxonoruw_jitazobakogizu_lonuzokovited.pdfIn PDF document text
    • https://cdn.sqhk.co/xedasuzefer/cIfRjdK/numpy_for_python_3._6_ubuntu.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/hdhcQjf/14043666629.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/segajujizitut.pdfIn PDF document text
    • https://cdn.sqhk.co/kebubupoxiz/dP7A6hc/79344944802.pdfIn PDF document text
    • http://kimokabif.medianewsonline.com/87414497487.pdfIn PDF document text
    • https://cdn.sqhk.co/relewimimoro/ihg8kja/xaladewofukafagekalu.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/hbiXjhd/sadomogajawumemalef.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/zareba_100_mile_fence_charger_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/cjjCjg3/stickman_simulator_zombie_battle_mod_apk_android_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_53d28679333f48cba22678aa61343357.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_2611b71790bb472a9c00f30bcb34653c.pdf?index=trueIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_4c382cb65c0e4bd6893c5573894d9c8b.pdf?index=trueIn PDF document text
    • http://gafodix.myartsonline.com/36428331410.pdfIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_361d1bd955344110aab0addc2af661cb.pdf?index=trueIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_5869d154c67341a8abbc6f44a3c3d607.pdf?index=trueIn 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_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 5292 bytes
SHA-256: 7bba4b7ecaa13f907c5e33185bd8881d24eb193366ca145657b664172f630f5e
font_01_sfnt_off00010b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B96 11588 bytes
SHA-256: e6ca0c8530d5ca76585cb7dbbaf00f8e05da596634b8f588f508d6ee86f49a83