Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c71e47ae9d0998…

MALICIOUS

PDF

128.4 KB Created: 2021-04-02 23:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5dd17f076874ff85a29c7a4196f64bf4 SHA-1: 57fc34ff8a1c29a52c0903688a35fbf61c9a2d5e SHA-256: 43c71e47ae9d0998e41129c3dd01c41e4c8c02df1c7c4e1e2f9b8bff73e616f3
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating a link farm with numerous external URLs, one of which is directly linked to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://dafemum.ru/strik?utm_term=yoga+asanas+names+and+pictures+in+hindi PDF link annotation
    • https://cdn.sqhk.co/nisugavu/TjhgjyH/top_music_20202.pdfIn PDF document text
    • https://labejewatek.weebly.com/uploads/1/3/5/3/135399287/19c17da9e.pdfIn PDF document text
    • https://cdn.sqhk.co/kusedesomawa/BF6hdjd/44163009797.pdfIn PDF document text
    • https://narusipanunajix.weebly.com/uploads/1/3/1/0/131069819/pemedavinar.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/hdjcaoI/basketball_shooting_drills_by_yourself.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/vodesi_dakukiganovuw_gipetoxerom.pdfIn PDF document text
    • https://gisimezibeze.weebly.com/uploads/1/3/0/8/130874543/mubudumevosofik-nejemapi-getug.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_7cf3f29e45884e01978275d56ca1fabd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/dark_heresy_daemon_hunter.pdfIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_8c7b8636da6846789e77364a692bc242.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/woretuponu.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/formulir_klaim_asuransi_kesehatan_axa_mandiri.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_88940250dca947c8b0809f993587253c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vanatul/vevetivumimoxobopirete.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/10562587751.pdfIn PDF document text
    • https://df867d32-629d-4b48-af14-2fc5df20f827.filesusr.com/ugd/287761_ec1ed2ad1af74e6c9269b70002ef21fb.pdf?index=trueIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_1c10ad9ca46341ab813d9b59dd547915.pdf?index=trueIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_3c9228d8ed434a3bbe666d8d568390f2.pdf?index=trueIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_e590641bb052408e8c6b350da189cc6e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazawojob/which_is_better_the_ninja_or_nutribullet.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_507308cd302a47b9b4dc85dfe0b71c18.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_3b381c155c5c4a79a4830f160df5931f.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_3251ac829bb54a20b29109a3c2d57e73.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001befe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BEFE 16940 bytes
SHA-256: eecd723e363906f6d3a56eea86f12c6481552aab992131db97fe3bb8685f2724
font_00_sfnt_off00015e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E06 5416 bytes
SHA-256: edcfe4f2eae90812ceda08b4c60f2140a4895b10a1c95e507618031a11d96f56
font_01_sfnt_off00017049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17049 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00017bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BAC 10828 bytes
SHA-256: 018b36c1f4494543c1c6cca088612b4dea3c73cde0eeb5d4bda81596349310d0
font_03_sfnt_off0001a0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0E1 18896 bytes
SHA-256: 891a10b58f47f3e473928796061d8998f4fdea1c5ce4e472a85f796d89dbc5ca

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