Malicious PDF — malware analysis report

Static analysis result for SHA-256 315969179e044c06…

MALICIOUS

PDF

109.5 KB Created: 2021-04-07 01:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49f2af6a1128ce1770e34c51515f36f4 SHA-1: 3b55a3867fc2c160d358944113ece6023ae02302 SHA-256: 315969179e044c062d98b258a516a55b9fff24b9505d6ad16751772c40ae6c9d
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_LINK_FARM heuristic suggests it contains a large number of external links, likely to manipulate search engine results or redirect users to malicious sites. The embedded URL `https://nipisod.ru/strik?utm_term=what+is+the+theme+of+call+it+courage` is a primary indicator of this activity.

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://nipisod.ru/strik?utm_term=what+is+the+theme+of+call+it+courage
    • http://vikolumubibo.scienceontheweb.net/editing_text_in_photoshop.pdf
    • http://edevletorg.com/46183272014874u6.pdf
    • https://mogoribomos.weebly.com/uploads/1/3/4/2/134266362/9811564.pdf
    • https://veburuja.weebly.com/uploads/1/3/0/7/130739173/4409fa4648a59a7.pdf
    • https://fupiloxeti.weebly.com/uploads/1/3/4/3/134380404/sipejoluzi-sapamenoz-vozunanag-jutufot.pdf
    • http://gozimudowojuzun.mypressonline.com/78463901023.pdf
    • https://bebojeraje.weebly.com/uploads/1/3/5/3/135302211/5d31afa536.pdf
    • http://clientbluebadge.com/dari_ke_word_candyfipe8.pdf
    • http://doxalasi.mywebcommunity.org/how_to_test_if_someone_can_follow_instructions.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dupula/kgf_hd_movie_in_kannada.pdf
    • https://s3.amazonaws.com/vinejivunitego/26100371068.pdf
    • https://s3.amazonaws.com/saziwijaxodav/roadmaster_granite_peak_24_inch_bike.pdf
    • https://s3.amazonaws.com/waxegatulo/ben_10_game_apk_apkpure.pdf
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_5a8e4bd72a6d4fd1b6ecb69639c8d825.pdf?index=true
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_37f6dc001ed74303a20066330031b1d4.pdf?index=true
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_3a07a62ddab249bab98c7489c496dae3.pdf?index=true
    • https://f33eab34-52c4-4f1b-91c9-7c5ec1255b8f.filesusr.com/ugd/9d0374_668eba9fefe2428a995fab9ff6f9179b.pdf?index=true
    • https://s3.amazonaws.com/vebogotexaf/simplifying_algebraic_expressions_with_indices_worksheets.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_off00016dbe.bin
3f81c0a7479851b9c11e173456ac2252bb48ef785ff1c7d1b210db17650dd8a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DBE 5308 bytes
font_01_sfnt_off00017fb0.bin
f18388228cfe604c01634e1c3c9e0c843107fb734b4dd2f1360bdbcdf2ef511f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17FB0 11904 bytes

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