Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfe7f6795b3a9a5…

MALICIOUS

PDF

76.3 KB Created: 2021-04-03 05:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cc2a611c0a305fabde30a87b5b27439c SHA-1: 225b6145f10eec5791e756af552526d93eeee800 SHA-256: 4dfe7f6795b3a9a513ffe496d090925eb391fe9f140074451c1dd690c00f213f
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, suggesting a link farm or SEO poisoning attempt. The primary malicious URL identified is https://midufefew.ru/strik, which is presented as a guide for installing a child car seat to entice clicks. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links is a common tactic for distributing malware or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://midufefew.ru/strik?utm_term=how+to+install+rear+facing+maxi+cosi+pria+85 PDF link annotation
    • http://canonsburglake.org/48692770784k84rk.pdfIn PDF document text
    • http://vwwv-avito.online/puxej3osu2.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/zenefebelejizusufavatimvq5.pdfIn PDF document text
    • http://apkweb.net/69634658341gso5z.pdfIn PDF document text
    • http://usejus.club/vox_ac30_c2_vs_c2xrlsz1.pdfIn PDF document text
    • http://get3creditscores.info/is_the_wolf_of_wall_street_on_netflix_usa32yz.pdfIn PDF document text
    • http://tesar-krd.ru/apush_amsco_chapter_12_guided_readingq9r44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_a0f66f6452ca46efb9f1c86ba4f010ff.pdf?index=trueIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_06553f8d5bc14a56a2c08b3673c9d44f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/tunabonid.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/29157048874.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/what_is_the_syllabus_of_class_9th.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_e62c9ef93a304b7fa711e094c33a5802.pdf?index=trueIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_648bbbbde48f419d8a5352b9c58bad30.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/brave_and_beautiful_free.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_4904b63fdaa0439f999daf97ba2b1ece.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/delonghi_nespresso_lattissima_plus_milk_frother_not_working.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_0a16a978b3c644479a5c9da794525666.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/twitter_videos_to_camera_roll.pdfIn PDF document text
    • https://1d20f49f-ccd6-4d05-b9af-9ecc574be1a3.filesusr.com/ugd/7b50d7_60d73b49b86044be8363d5b29152b19e.pdf?index=trueIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_6b23a763d048494bba3342ceb8b3a472.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_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 5772 bytes
SHA-256: 9b8fb366220dd97c51e1c558ab95a98aa17273a996dd228ae1151ff25aec14a9
font_01_sfnt_off000100f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 10164 bytes
SHA-256: ecf793a3f40365607d8c4ce82ee8a017eedda69ed1e9580cb72fe9ace2e40c29

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