Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfbedd2a1b6b6a8…

MALICIOUS

PDF

81.8 KB Created: 2021-03-22 03:31:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59f8edc641967d4d0bd9db5e0ef57959 SHA-1: 9a3fb9cd2bb235c9002bace626bc6fb4fe894d4b SHA-256: ddfbedd2a1b6b6a85c710436cf4e63cf8296b9b4f32148f42a004c1dc06e88e0
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 are suspicious, indicating a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a malicious document, likely delivered via spearphishing.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=unkilled+apk%252Bobb+offline
    • https://nogusuxewi.weebly.com/uploads/1/3/1/4/131438155/dipufaxeda_fofibep_jevotimogozu.pdf
    • http://mattelipsticks.site/how_many_seasons_of_tokyo_ghoul_does_hulu_haver6glj.pdf
    • https://cdn-cms.f-static.net/uploads/4402000/normal_5fdb8c9f04a67.pdf
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/lisen.pdf
    • https://cdn-cms.f-static.net/uploads/4530712/normal_602f0993433a7.pdf
    • https://betetitowuti.weebly.com/uploads/1/3/4/3/134331261/jopukelalusa-tokimiv-zupevelowu.pdf
    • https://cdn-cms.f-static.net/uploads/4464730/normal_604d726db668f.pdf
    • http://hotita.space/against_interpretation_and_other_essayso111b.pdf
    • http://cyberlife.store/cant_stop_wont_stop_book_onlinexi2k4.pdf
    • https://cdn-cms.f-static.net/uploads/4410956/normal_60322b668443d.pdf
    • https://vijibasotaxeja.weebly.com/uploads/1/3/5/9/135990507/e6a51acb8f1760.pdf
    • https://petovowatudero.weebly.com/uploads/1/3/1/6/131606592/wekugopelana-ditexodexaluwi.pdf
    • https://mozevosiku.weebly.com/uploads/1/3/3/9/133999333/xetane.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wurivuve/how_many_hours_does_it_take_to_dehydrate_beef_jerky.pdf
    • https://s3.amazonaws.com/votuweroxigezog/spring_framework_maven_bom.pdf
    • https://s3.amazonaws.com/feborobegibew/michelin_guide_camping_caravaning_france.pdf
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_fc3f00b6116c4954a515cc634b83769b.pdf?index=true
    • https://s3.amazonaws.com/xasovewipeje/tiragiposepojifarudan.pdf
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_c44b11a525944f98b7f9eae9e93523b7.pdf?index=true
    • https://ff5ab256-a407-4697-91b9-141751226614.filesusr.com/ugd/4205e4_24586b13877649938045da57d18f2782.pdf?index=true
    • https://s3.amazonaws.com/fivebo/490804717.pdf
    • 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_off00010166.bin
c2fa1f58eca7b9b0e2d2a54fa413fcbfc3032d22074aae4c6c5bd8fdadb69a34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 4956 bytes
font_01_sfnt_off0001125f.bin
05e24eb4e8b89f59d33a3b628863ee51ac954ee7a9bcb0207322b0d2fca0aa28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1125F 11276 bytes

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