Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f8bc92fb290721…

MALICIOUS

PDF

82.8 KB Created: 2021-04-04 14:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d080494a366c24c8b6147f1fa8d5e20c SHA-1: de711372b26d0e27a8fcc879fb5f51fb25694ddc SHA-256: 95f8bc92fb29072109e06e3064d92be6142c192f5a28479b93250cb2f3afcbf5
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URLs, many of which are disguised as PDF downloads. The primary URL, 'https://maypoin.ru/wix?keyword=download+facebook+lite+apk+app', suggests a lure for users searching for specific software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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=download+facebook+lite+apk+app
    • http://nitafibejuze.mygamesonline.org/what_color_magic_deck_should_i_make.pdf
    • https://cdn.sqhk.co/mubasetopagu/x5jioOp/download_bleach_mobile_3d_apk_data.pdf
    • https://cdn-cms.f-static.net/uploads/4366008/normal_60363026b2d70.pdf
    • https://cdn.sqhk.co/nobixapo/jCxifii/zarchiver_pro_apk_download_for_pc.pdf
    • https://cdn.sqhk.co/zumufapofow/7Wid9gh/36966256886.pdf
    • https://cdn.sqhk.co/gidetixi/hcOieoi/walking_dead_s10_finale_date.pdf
    • https://cdn.sqhk.co/guranotup/xiemyWt/48923677086.pdf
    • http://bimadepunepi.mypressonline.com/pdf_to_word_program_best.pdf
    • https://cdn-cms.f-static.net/uploads/4406785/normal_604a0f7b51543.pdf
    • https://cdn.sqhk.co/balaragu/izf4xKq/dadajepoxegesonunedutezut.pdf
    • https://cdn.sqhk.co/vutowogipu/iigcVto/tixufumokadafafazuwabowu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gixopiv.onlinewebshop.net/64597437865.pdf
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_ce23661d015d4b2fa8147659636257b1.pdf?index=true
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_41dcbe1d162d43668b38cc9ee3cacff2.pdf?index=true
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_055f6beab68c4b3c9cca1aa4ef5f1342.pdf?index=true
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_a8c05c9897144e23b608b7cb2802b382.pdf?index=true
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_baef3755d46c4e2393f2741f43855a31.pdf?index=true
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_28ab6de0c25f42a2a49b6c9319c40e39.pdf?index=true
    • 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_off0000f661.bin
dece8de6151afe407d07e714dc79a11e532b27cc20ea4955dc195cfaaeabdc5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 4956 bytes
font_01_sfnt_off00010764.bin
cae13992254fa23183e07a6eb28f95729939674fe3d10abe55e9c037c8332bb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 11472 bytes
font_02_sfnt_off00012e66.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E66 4324 bytes

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