Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c053c59d98b7be0…

MALICIOUS

PDF

75.8 KB Created: 2021-03-29 20:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d25d3257cd2b58decc79f56c26b677b SHA-1: 6a67ed0e4dfdf80ff881c867068cecda02792034 SHA-256: 1c053c59d98b7be04dc64d41db72c19e7526de99058f180d3dc9e1759f1f1f89
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary focus on a URL that appears to be a SEO link farm designed to attract users searching for specific PDF content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=descriptive+statistics+mcq+pdf
    • http://help-ruleviolation.com/best_lyric_video_maker_macgkpb1.pdf
    • http://kuliwegi.sportsontheweb.net/notebook_acer_aspire_one_windows_10_display_driver.pdf
    • http://fajujefa.getenjoyment.net/wemalo.pdf
    • http://usblighter24.site/chocolate_girl_song_kannadaqwyvm.pdf
    • http://kdghy.online/48473382456oxokl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_a04db2def51f49969420efa8f54d7439.pdf?index=true
    • https://uploads.strikinglycdn.com/files/54cbad3b-53ee-4e97-919f-1275a3d6583c/toyota_camry_se_for_sale_2020.pdf
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_aff693970f3541399b966114a1c57bca.pdf?index=true
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_7542929adf0947b9bf22cd3c57eb3b77.pdf?index=true
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_225d4e777661439c863a5252ac78b449.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fda2a10b-4926-47ae-b1d7-c88a34622560/wusetag.pdf
    • http://ruriwujuvuwa.epizy.com/juwagowibul.pdf
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_b341ca794de54021a112e754841735cd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4b9a0227-63cf-4cb5-8106-47b18ab383f7/howard_miller_table_clock.pdf
    • http://zofunumuwade.rf.gd/9482807177.pdf
    • https://78f5967e-1348-44d0-b43d-4fba71d4c3e7.filesusr.com/ugd/a94f6a_e8d8f957a75a4eabbc687ce0b5963992.pdf?index=true
    • http://zonadomafi.rf.gd/48317990742.pdf
    • https://uploads.strikinglycdn.com/files/14dbc6f6-de05-4472-9339-4e42b2f42f50/2nd_grade_english_workbook_free.pdf
    • http://popavager.epizy.com/scrivener_tutorial_mac.pdf
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_910b4c5a2a4d415192e1dfb5fb814444.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6ee68736-874e-478e-9b7e-a3c654587c34/what_happens_in_the_last_book_of_the_after_series.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_off0000eaba.bin
0cc8ae27d95aa3748abf4fc30c3f786739b2ae27248a794c1ffc10a22d431587		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 5456 bytes
font_01_sfnt_off0000fd3d.bin
4c7a6ac95dd10c85a701e350afd8a6848b6b8789230117b20039521fa01572a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 11000 bytes

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