Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a5b2972a363f31…

MALICIOUS

PDF

83.5 KB Created: 2021-04-05 06:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7d01a10f817c86752816f3e6773b439 SHA-1: dfa1656fb45dd62f55c5fc3b272172b8003ad7f1 SHA-256: 19a5b2972a363f31b5588e052f64aec872d39b7213638e90ec77dca04af89a4c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to domains commonly associated with malicious activity, such as jumiwimov.ru and cdn.sqhk.co. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting an attempt to create a link farm for SEO manipulation or to distribute malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/award?keyword=gcse+english+language+revision+booklet+pdf
    • https://cdn.sqhk.co/zuzipogowita/fH1P4EX/gimege.pdf
    • https://jipowikufimur.weebly.com/uploads/1/3/5/3/135327107/189d0ac9bb5a.pdf
    • https://cdn-cms.f-static.net/uploads/4450504/normal_604ae074ba976.pdf
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/gilakobar_duzep_wigixezig.pdf
    • https://posilukununafux.weebly.com/uploads/1/3/4/4/134498017/190adfa978e8.pdf
    • https://relazubaw.weebly.com/uploads/1/3/5/3/135315829/jododuwawaput.pdf
    • https://bufetokarad.weebly.com/uploads/1/3/4/0/134096279/46965165c97.pdf
    • https://bubebozozuj.weebly.com/uploads/1/3/1/8/131871643/5035276.pdf
    • http://allerop.xyz/12473783420b41bh.pdf
    • https://fafidapumexeri.weebly.com/uploads/1/3/1/4/131437561/7756823.pdf
    • https://static.s123-cdn-static.com/uploads/4445564/normal_5fc5f9c21c638.pdf
    • https://cdn.sqhk.co/nevupediwix/ihhhaJm/87190340766.pdf
    • http://romeoplanet.club/baba_balak_nath_ji_ki_aartih95a7.pdf
    • https://cdn-cms.f-static.net/uploads/4426269/normal_6047d11d41aec.pdf
    • https://xikodixugab.weebly.com/uploads/1/3/4/7/134707070/6810240.pdf
    • https://cdn.sqhk.co/sinemajud/icuMmrM/marvel_contest_of_champions_download_free.pdf
    • https://cdn.sqhk.co/lanasido/47WIhiI/easy_top_up_three.pdf
    • http://salebox.shop/fowenivujerav4ll7.pdf
    • https://cdn.sqhk.co/gufojakig/hduONGr/mikuzew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/polexebuj/what_grade_level_is_the_ged_equivalent_to.pdf
    • https://s3.amazonaws.com/batiku/chamma_chamma_video_song_1080p.pdf
    • https://s3.amazonaws.com/wiwuxot/gilding_metal_sheet.pdf
    • https://s3.amazonaws.com/wefemabeni/sadinatafodu.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_off000104c1.bin
4e1ce2c28e5bc03ce0a494079b009d72f611cb840f8e6497f76f3df96ec1f8f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 5712 bytes
font_01_sfnt_off00011839.bin
b223e2e8673727f295fe71567408759551a93b9f380586c5b7a929aa76dcaf2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 11736 bytes

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