Malicious PDF — malware analysis report

Static analysis result for SHA-256 de854186e14fabe4…

MALICIOUS

PDF

77.6 KB Created: 2021-03-19 16:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 47fb1b8f4a4b11da65822a8e4d3d0106 SHA-1: 6948bb7dd04cf28279e2b41ffcafbe5bf437b2f0 SHA-256: de854186e14fabe417e7b18089dcb162dfb4a83a7990b3c4fefaac1b581f6323
186 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/123?utm_term=basic+accounting+tutorial+pdf+free PDF link annotation
    • http://sujabupinoda.scienceontheweb.net/histologia_e_morfologia_das_angiospermas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444351/normal_5fe9c6c3966ac.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/55626410401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444377/normal_603a3eda2626c.pdfIn PDF document text
    • http://polobasopika.mywebcommunity.org/introductory_mathematical_analysis_for_business_economics_and_social_sciences.pdfIn PDF document text
    • http://changely.club/klipsch_promedia_2.1_bluetooth_review2nv08.pdfIn PDF document text
    • http://gbo.guru/guzuxexonowbta0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_1b998ff5f62a4b70a8ebf8abf11eff3c.pdf?index=trueIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_5dffc9aa8fa744b99883e47e828e4569.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_8aecc5829e464e02953ecaa057564cf7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4d1a3b-bbda-4398-b18c-01c53117d758/how_to_get_xbox_live_gold_for_free_2020.pdfIn PDF document text
    • http://xawiwevivuzox.onlinewebshop.net/farulugenetigaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad16d4f-9eec-4e8a-b74c-cde4282b2369/8705265860.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_98052af99b504273867241e5c115fe64.pdf?index=trueIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_cfa63bc8e2be441db58241eb51f61c74.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_cc578e8cfd494343b288c3d06e4af4a7.pdf?index=trueIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_e6d990ae30e64c27ab24efa81a0d0485.pdf?index=trueIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_1c4330e0e0dd4bf8a9be3208ed747bc8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1720e203-ad42-403f-9bb3-bc7e6a586f34/sanomamoxeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e79c20-906e-4608-96e4-4d595575ca64/behringer_pmp2000d_europower_2000w_powered_mixer.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_fc77e85b32ac4079bae6824e58be2317.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_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 5372 bytes
SHA-256: ff5c7c4005e2427cb7be4320619484c5355100ba226132ebf035419447b41bfa
font_01_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 10408 bytes
SHA-256: fb654b0c184018a9c82c762dba7570bf96ebe56c0980ef15c51bee78a5e5f593