Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecac799c5a63e3b7…

MALICIOUS

PDF

86.8 KB Created: 2021-03-06 11:20:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6658ba7f02acee021ca9659225369b7e SHA-1: 424ef0f7b9478c7797ebc7c196ed62f8cfe2dbd4 SHA-256: ecac799c5a63e3b79b06f741aacb0a2382f0d91d1e956e521220ee22ce9c3f41
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to malicious websites for credential harvesting or malware distribution. No scripts were extracted, but the PDF structure itself is weaponized to host and distribute malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=what+is+sunset+linear+broadcasting In PDF document text
    • https://fawesilabe.weebly.com/uploads/1/3/2/6/132680990/gijatej.pdfIn PDF document text
    • https://rixagaxovexi.weebly.com/uploads/1/3/4/0/134000332/32c616d45ba39.pdfIn PDF document text
    • http://selowopax.22web.org/45634697058.pdfIn PDF document text
    • http://detolenikalopaj.iblogger.org/nirevomuzefir.pdfIn PDF document text
    • https://lulipexo.weebly.com/uploads/1/3/5/2/135294167/zudoxavozasefu_nifadonomawi_numifokawizu_pudopopukus.pdfIn PDF document text
    • http://zaranes.getenjoyment.net/playboy_song_mp3_download_djpunjab.pdfIn PDF document text
    • http://valobunobatab.iblogger.org/halimbawa_ng_tabloid_at_broadsheet.pdfIn PDF document text
    • https://tuverasoxodos.weebly.com/uploads/1/3/4/7/134745130/dba7db.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/trane_xl90_service_manual.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ledugezutixajo.epizy.com/zojavirizalewubem.pdfIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_282b698898de40638fbf03352f76c47c.pdf?index=trueIn PDF document text
    • http://xijovapafibowuw.rf.gd/eine_kleine_nachtmusik_piano_sheet_music.pdfIn PDF document text
    • http://tofujuwo.onlinewebshop.net/focusrite_saffire_pro_40_macos_big_sur_review.pdfIn PDF document text
    • http://sapovupiz.rf.gd/kujinivikemakow.pdfIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_ca42496d379d4353b64f9757679a673f.pdf?index=trueIn PDF document text
    • http://fawivemepogu.epizy.com/60084868052.pdfIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_9ce4d57138d8451cb249055d4d0886df.pdf?index=trueIn PDF document text
    • http://zetafilutebes.rf.gd/aga_khan_laboratory_online_reports.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f955.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF955 16908 bytes
SHA-256: e1bc543ad57ae22c99ee195a2fece227238a0acd59c6c9c913e0bc2422c67769
font_00_sfnt_off0000e72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 5352 bytes
SHA-256: 8b8fb5aa45bae782c460a14694b4e79525d3d6836a548e45817fc4c495a116ed
font_02_sfnt_off000127ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BA 10480 bytes
SHA-256: c3edb7c3ea5b7b8c53c6be3c696497abebf1923c8895de0692bd32052a261174