Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9796d0d14dc3dd…

MALICIOUS

PDF

76.9 KB Created: 2021-04-06 05:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 751dc0978a1e34adf6f71fc0153ebfb7 SHA-1: eeab2dba07a7cf0a89f8aee54af82aaad9c02566 SHA-256: ad9796d0d14dc3dd468499c43d1a15b393cc1a39d1801f8858642fc079a5e25a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on dynamic DNS services, indicating a link farm or redirection strategy. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=what+does+it+mean+when+a+contract+is+voidable
    • http://ludozikime.22web.org/23251845232.pdf
    • http://sunepoxuvigos.66ghz.com/caballito_de_mar_caracteristicas.pdf
    • http://tesilav.sportsontheweb.net/ambiguous_loss_book.pdf
    • http://dugarudewemudo.sportsontheweb.net/10737053158.pdf
    • http://kulefinimujaleg.iblogger.org/dalabonavasoxumevose.pdf
    • http://zodatowafe.getenjoyment.net/too_big_to_fail_movie_online_free.pdf
    • http://wrinklestiltskin.com/vofirunuxodejukizexabaw476.pdf
    • http://avtoshkola-region26.ru/cornerstone_hillsong_lyrics_and_chords6cc11.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tixuranezusox.epizy.com/14910411158.pdf
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_9143cd12f2ef4dbc8b8457ad5dc9a748.pdf?index=true
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_c4eb95f1c4e541a1ab39466e36457dbe.pdf?index=true
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_16c2720a5198472ead21d454924e1ec0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ebef7fab-44f9-4d46-bd95-a7f2bfaf77db/83440840751.pdf
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_a044ece41f1c426eb82854178115f9c7.pdf?index=true
    • http://vejegaba.atwebpages.com/famovo.pdf
    • http://perexuwofogefo.onlinewebshop.net/75940571460.pdf
    • https://uploads.strikinglycdn.com/files/31c80a74-f6e8-48fe-9cf7-b33e939be3eb/constitucion_de_puerto_rico_definicion.pdf
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_4a74eb687e944bc2ab7e24ac2f0a9fb3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/32d6c9bb-9ea4-428e-89a3-283354eec2c1/kidulel.pdf
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_f5b8f33b3b94419ea31a0203bd7fa378.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5d.bin
838f2e7da4b4103187d5120b2089309be61044154b93b00a6b0df021dbacf1b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 5484 bytes
font_01_sfnt_off0000fef7.bin
d67fa5fa4a90b16295ea2deb1f9463618f6bbc3b944fea807828aa506f4a60ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 11544 bytes

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