Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f9b22c2ba631ab…

MALICIOUS

PDF

81.3 KB Created: 2021-04-05 10:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53a74896f73dc0c9ef210be7726d375b SHA-1: a91b624af6cb41bf354577bf8d19b541b791f688 SHA-256: 11f9b22c2ba631ab61935ae5e99668f734b2a6487982c0c7c499ed2338e8768a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a "PDF_SEO_LINK_FARM". The document body, though heavily obfuscated, suggests a lure related to "renewable energy definition pdf". The presence of multiple unknown URLs, including one from 'seumenha.ru', indicates a likely phishing or SEO spam campaign. No scripts were extracted, but the overall structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/award?keyword=renewable+energy+definition+pdf
    • http://stebsmeh.space/peluzazipegufeku4gtfo.pdf
    • https://cdn.sqhk.co/zimuteraf/cgePjbb/21773499898.pdf
    • https://cdn.sqhk.co/jimikafede/hhjdjrN/wood_cutter_game_online.pdf
    • https://cdn.sqhk.co/towevefizub/ifjhIqd/j_tube_rocket_stove_dimensions.pdf
    • http://cparta.moscow/algebra_1a_slope_intercept_form_worksheetelclt.pdf
    • http://azorocheat6.xyz/ms_word_shortcut_keysadhnd.pdf
    • https://cdn.sqhk.co/firavibaw/Xfmggje/14552511352.pdf
    • http://prosucre.pro/865457621601yhhd.pdf
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/pimave.pdf
    • https://paguzijap.weebly.com/uploads/1/3/1/4/131453408/d5a1e80914e.pdf
    • https://welusagosa.weebly.com/uploads/1/3/4/3/134355806/roradovi.pdf
    • http://storeplus.pro/libro_que_hago_si_mi_media_naranja_es_toronja_resumenv7p65.pdf
    • https://cdn.sqhk.co/fedijadika/aehbhjg/cityscape_neon_city.pdf
    • https://xasedomag.weebly.com/uploads/1/3/1/0/131071243/pumomunovojasi.pdf
    • https://cdn.sqhk.co/gunonutib/hpAjibD/2827191652.pdf
    • http://app-3null.com/naruto_shippuden_ultimate_impact_chejwq7y.pdf
    • https://cdn.sqhk.co/nejisakatok/cijhaCy/62232874318.pdf
    • http://tomandbxof.site/tejit4gwr4.pdf
    • https://cdn.sqhk.co/tuminageka/rgggfmC/pidofij.pdf
    • https://napuguvu.weebly.com/uploads/1/3/0/9/130969658/8bb683346a2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/351f9add-db70-4e77-a044-2e269873cf6e/62882186592.pdf
    • https://uploads.strikinglycdn.com/files/11b2b397-8e2e-46cc-8ff0-3de095c1a8ff/xazowojewavagu.pdf
    • https://uploads.strikinglycdn.com/files/3ee8729f-fe79-420d-bdca-8cf297f73a52/56123733536.pdf
    • https://uploads.strikinglycdn.com/files/4d258dae-a705-456a-9c5b-73d4c3b3d722/44503235780.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_off0000ff2c.bin
e21959ab6ab6569f8b76a65be4aac890806f4676e4c2b1829ddb1483ff132675		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 5372 bytes
font_01_sfnt_off0001119a.bin
6efee5f386830995af41f856a122e7b40129ad85065bc2f360fc77abbe168bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1119A 11260 bytes

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