Malicious PDF — malware analysis report

Static analysis result for SHA-256 1551d67a6afe6a93…

MALICIOUS

PDF

78.7 KB Created: 2021-04-01 20:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b372b7cd58c6ede5f29b1a74997a0f62 SHA-1: e09aed1b7f4a9967ca890472329546a3d4f483e7 SHA-256: 1551d67a6afe6a93f9b59294b28a7c4d7719f9aaef78477a89fa514d04dfeab7
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external URIs, particularly the one pointing to maypoin.ru, suggests an attempt to lure users to potentially harmful content. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=4-6-2+streamlined+locomotive
    • https://cdn.sqhk.co/temejikowewa/bdTjgez/easy_wood_projects_for_high_school_students.pdf
    • http://tedamowajowiw.22web.org/tujumepavijukoza.pdf
    • https://cdn.sqhk.co/dosakupu/jcjiX3w/ginumiwodojakinasegeja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://02aee961-309f-4c8b-9790-08f12c26706e.filesusr.com/ugd/8321db_c5470d2b94614f33a866a9fd472ed79d.pdf?index=true
    • https://s3.amazonaws.com/kiwopusafize/standard_scientific_citation_format.pdf
    • https://s3.amazonaws.com/rowubunak/amazon_audible_app_for_pc.pdf
    • https://s3.amazonaws.com/mipeboro/88523784853.pdf
    • https://uploads.strikinglycdn.com/files/1fca1dcd-0604-4bbe-ab48-027b558d51a0/how_to_think_like_leonardo_da_vinci_book.pdf
    • https://s3.amazonaws.com/puretulenuza/amu_b_tech_form_2018.pdf
    • https://uploads.strikinglycdn.com/files/e74ac5e5-2b8a-4b98-9c52-b344090e828d/66778491785.pdf
    • https://s3.amazonaws.com/kiwopusafize/trimethylaluminum_mediated_amide_bond_formation_mechanism.pdf
    • https://s3.amazonaws.com/takebemanijewok/demand_promissory_note_template_canada.pdf
    • https://uploads.strikinglycdn.com/files/12d32c14-6943-4a26-998d-18e7e74b1e61/how_to_replace_a_ceiling_fan_with_a_downrod.pdf
    • https://s3.amazonaws.com/vonusirukete/canon_pixma_mg3520_ij_scan_utility.pdf
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_73da4372019642d09854439af96207ba.pdf?index=true
    • https://s3.amazonaws.com/fevobelijogal/innova_3320_auto-ranging_digital_multimeter_price.pdf
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_5a3e83f0075045eaa1e0a29c92bb75f4.pdf?index=true
    • https://s3.amazonaws.com/fekazudabo/vexujop.pdf
    • https://s3.amazonaws.com/sisaxu/gobuvevezadenigudage.pdf
    • http://munoxefarofow.rf.gd/95615145011.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_off0000f425.bin
20a87bb0d44197ff80b0cc7b76b4df996f9df2fddbd60c50178dc33dce45136c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 5456 bytes
font_01_sfnt_off000106ac.bin
0b5b1d5ffd130235dd123ae01d6a609514066e290a7278b2a5081b41dfd1c750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106AC 11396 bytes

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