Malicious PDF — malware analysis report

Static analysis result for SHA-256 2851236b598b0340…

MALICIOUS

PDF

79.6 KB Created: 2021-03-18 09:31:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76c10abd58af975867efffe0a0c5da66 SHA-1: 33df425c7eb26408fbc4b23554a863284aa3d25f SHA-256: 2851236b598b0340cdf62c0880829310d5f35d4330e2c3a5bd0cc11664d251cd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains an embedded URI pointing to 'midufefew.ru', which is likely a phishing or malware distribution site. The PDF structure also indicates a link farm, suggesting an attempt to generate traffic or distribute content through numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/wix?keyword=median+altitude+perpendicular+bisector+worksheet+with+answers
    • https://cdn-cms.f-static.net/uploads/4368997/normal_5fda63b7143b2.pdf
    • https://static.s123-cdn-static.com/uploads/4480743/normal_5ffcfab1b74ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/4d13748f-3f46-4fdd-8829-f74083cae1ef/82213157132.pdf
    • https://uploads.strikinglycdn.com/files/cc4104e2-4f46-4680-8297-f30c063cd6cb/loforok.pdf
    • https://uploads.strikinglycdn.com/files/918a199a-4bac-4118-9499-a3d773f019af/58505101709.pdf
    • https://s3.amazonaws.com/fixararololu/90279078466.pdf
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_53c31de92670409685a079543cf99c50.pdf?index=true
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_60400fe16db049aaa9411c045f52732b.pdf?index=true
    • https://s3.amazonaws.com/dobikasukavu/20629081887.pdf
    • https://uploads.strikinglycdn.com/files/0bce10b2-e6e9-4534-bfb3-667a70e3df88/why_my_ipod_shuffle_wont_charge.pdf
    • http://rarefovukafulu.rf.gd/wasekobodadinotu.pdf
    • https://uploads.strikinglycdn.com/files/540f2d76-5d81-4031-b96d-03af206ee44a/35896586523.pdf
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_3165616cad45421ca84de5f3e8e9dfc0.pdf?index=true
    • https://s3.amazonaws.com/tufitijinexu/2019_assamese_video_song.pdf
    • https://uploads.strikinglycdn.com/files/6272084d-236d-48b7-afe1-08d54a76692d/ganofiwoma.pdf
    • https://uploads.strikinglycdn.com/files/e3449e0f-6b4b-4034-a8a8-4b7d104fc0a4/how_to_fix_corrupted_files_on_gta_5_ps3.pdf
    • http://pofiwun.rf.gd/99414754497.pdf
    • http://sesilav.rf.gd/42585648650.pdf
    • https://s3.amazonaws.com/bagisi/budapest_convention_on_cybercrime.pdf
    • http://lelirovosas.epizy.com/gaxojidimuse.pdf
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_5101dcc76b99433f9852138806c08c9d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eaad528d-c492-4315-953a-3fced55e8499/63750221928.pdf
    • https://uploads.strikinglycdn.com/files/a54a575e-5773-4204-8042-90416e031d2e/cuckoo_clock_repair_san_antonio.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea22.bin
4e0657377cd26d3c650fe73c3ea9b7fe2bc847cac0dcb18b4d5c187eddf3a5e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 5344 bytes
font_01_sfnt_off0000fc45.bin
f28b5c3e2168ba1acb12040b0bf472fc6c2404df2eb34828cc03b2fa69db1f19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 11088 bytes
font_02_sfnt_off0001222c.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 4324 bytes

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