Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb60d4884715a3f…

MALICIOUS

PDF

80.9 KB Created: 2021-05-09 20:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 806de74345a99b17a916a3607daa7ebf SHA-1: 2c082c00c5e8dbcc77f172727a0bb67a2c52e768 SHA-256: 4cb60d4884715a3fd525152cca2e21eff2ff0d159f783e0b19f14f77ac26d849
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on S3 buckets, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://leonvi.ru/strik?utm_term=how+to+draw+a+realistic+nose+from+the+front', is flagged as unknown reputation and is likely the primary lure. ClamAV detection as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' further indicates malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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/strik?utm_term=how+to+draw+a+realistic+nose+from+the+front PDF link annotation
    • https://votebefi.weebly.com/uploads/1/3/4/7/134715150/lokisakopux.pdfIn PDF document text
    • https://najonetawo.weebly.com/uploads/1/3/4/5/134522785/f506ea388ab85d.pdfIn PDF document text
    • https://firudofomupavu.weebly.com/uploads/1/3/1/3/131384713/tinij_jaropozol_nidokiledoxuwom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nojemi/54895085727.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/miracle_box_crack_2._88.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/arctic_king_air_conditioner_8000_btu_portable.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/what_are_the_advantages_of_direct_rule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98108b76-8d94-43ce-9336-a1099b2d0ff4/hip_hop_hits_of_2005.pdfIn PDF document text
    • http://rawuwad.epizy.com/2361608339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9970c49c-a245-4c58-95e7-d186dcc45fdf/jardine_crib_conversion_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/which_college_is_best_for_graphic_design.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/igt_double_diamond_deluxe_slot_machine_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/chime_sound_effect_free.pdfIn PDF document text
    • http://tenisofirurefed.rf.gd/29420059122.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/venn_diagram_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/25110249690.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/89856759148.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_6e6966e6b79d4a9496bf550c79b58d48.pdf?index=trueIn PDF document text
    • http://labomodofu.epizy.com/jelipekokadaruronas.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_6c37a2b4cad146d6a7b0563ddd8cc50b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50898a2e-9c25-461f-ab59-94471c4b5cab/86326520054.pdfIn PDF document text
    • http://zunedolu.rf.gd/systems_of_equations_and_inequalities_multiple_choice_test.pdfIn 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_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 5316 bytes
SHA-256: e49a60feacbbe8fccdb868e734fbcfa6f9503fa21cf8153bf6598b73b5f6d797
font_01_sfnt_off000112da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DA 10400 bytes
SHA-256: 890b1cf24a00b67f0ae21f77dd0303aeceac1df1cd07daea61392a1795da8864

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