Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e3f137eda27042…

MALICIOUS

PDF

83.1 KB Created: 2021-04-03 04:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58cae68f8abfbb9aacb8f7eea7974fb7 SHA-1: b8742e2af3982f0b773e3dc6b56315852e4de882 SHA-256: e7e3f137eda270424bddae49ce8b2c50aef3bd5ce1971c18ffa2d38df1b3a7bd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the presence of many external URLs suggest it's designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/award?keyword=automobile+engineering+pdf+books
    • http://zalavsky.ru/international_marketing_16th_edition_cateorad2k9z.pdf
    • https://fodolirikixubug.weebly.com/uploads/1/3/5/2/135297927/sijonirago.pdf
    • http://matras-24.ru/pipajexixovi1y8.pdf
    • http://lifeit.pro/vuronczud3.pdf
    • http://filanion.online/why_wont_my_water_softener_stop_draining5tcbc.pdf
    • https://cdn.sqhk.co/zamokaxu/bghDWjd/nba_2k20_switch_lite_review.pdf
    • https://zutujoxiker.weebly.com/uploads/1/3/0/7/130776667/817156.pdf
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/b7cb6586d.pdf
    • http://balifruit.com/cw_0._9_windows_7_activatorzv0gx.pdf
    • https://cdn.sqhk.co/damukowabij/TihgeKW/gun_strike_3d_mod_apk_games.pdf
    • https://sujumakatu.weebly.com/uploads/1/3/1/3/131379709/sigefuga_navubeziweti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_4e80774bf1b24b99b461c2c19146e588.pdf?index=true
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_1e848e2e34b64bd396236459aad6aef2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ed8d64ba-34c5-4fd2-8d02-2cab81cad595/how_to_convert_wav_to_midi_in_studio_one.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/my_beloved_world_book_review.pdf
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_57493d8e20f8461698283e7868edd3db.pdf?index=true
    • https://s3.amazonaws.com/jamuluvuvava/57575639617.pdf
    • https://s3.amazonaws.com/rudelazifizuvo/bonokevogenubeva.pdf
    • https://uploads.strikinglycdn.com/files/32aee186-caf2-4d64-8b05-2c26722045b9/cant_see_nas_on_network_windows_7.pdf
    • https://uploads.strikinglycdn.com/files/8aefefc3-cb4d-4203-bd44-c11c10a548e5/23413485246.pdf
    • https://s3.amazonaws.com/rirusozo/kesubu.pdf
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_da5ce7351a134897b1183cfd3fc82714.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_off0000f610.bin
ee2dea2e876cde40f59afb69188151f521f7800c3c240d358cbe7382c6ddd436		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 5224 bytes
font_01_sfnt_off000107bf.bin
1433b1ead4f800cfbf20c4be60daa9b763930bfbeccc8f945ffbcf1e31a1b9f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 11488 bytes
font_02_sfnt_off00012f07.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F07 4324 bytes

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