Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb59bccbc00e569…

MALICIOUS

PDF

111.3 KB Created: 2021-03-05 08:54:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9d6c673744bf9b326d26c1299df68e19 SHA-1: 80f56ce57011244583c4f795e4c1e93c2a563cdb SHA-256: acb59bccbc00e569994316c353aa07704404a86e42fd377135e32edad02ce2e0
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically pointing to a suspicious domain, suggesting a phishing or redirection scheme. The PDF structure and embedded links are indicative of a link farm used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://golowaki.ru/wb?keyword=jesus%20is%20judge%20scripture PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404293/normal_601d87231f723.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/qumi_projector_q5.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/58122515995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479705/normal_601ab68b8e94c.pdfIn PDF document text
    • http://takipibimaxubov.sportsontheweb.net/ladafuzajifefewadexibezav.pdfIn PDF document text
    • http://nopokavami.iblogger.org/my_cousin_hates_me_yahoo_answers.pdfIn PDF document text
    • http://csxmoney.info/what_is_mithril_harvest_moon_light_of_hopebnffy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477162/normal_6022c41350596.pdfIn PDF document text
    • http://realnoe-obshenie.online/180279833733aady.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/lozigosowurege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_600d242f4d9e2.pdfIn PDF document text
    • http://vawurabel.mygamesonline.org/cuisinart_toaster_oven_troubleshooting.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_022c4f8f937246e3ba168866eed92efd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/135dd277-0bbd-442f-99aa-c145e9acbb3e/how_to_draw_palm_tree_leaves_step_by_step.pdfIn PDF document text
    • http://gijuvaginitawaz.epizy.com/bojezagijalamijinuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2edb5c55-5e74-4d30-b2f6-d22d8968a93b/tetafuladubafolepevuti.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_8f201e3182cc4390a0ac69d7a7422dec.pdf?index=trueIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_12bbaa9b852b405696c59590c6cb74ae.pdf?index=trueIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_5a8e167c83304e5f9b63debe635f4977.pdf?index=trueIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_67cb069a5c104aa88cb344ef65a0dbb4.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_off00017b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B5F 5064 bytes
SHA-256: 8538c66a212bc46a3812b01e563f388ecb8c2a5b2064b9897a0ec29852e014f3
font_01_sfnt_off00018cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CB2 10492 bytes
SHA-256: 06bdcdec81e574f7271ba11027acd9749a94bf6dc0e90dda354dbf69f3fd70ba

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