Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c733807aba8f4e1…

MALICIOUS

PDF

87.8 KB Created: 2021-09-17 15:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 150ea7956a21f1dae5e5a0130fb94df3 SHA-1: 7435cf9e3d73796305f0b10eeae79e0a77b8e006 SHA-256: 1c733807aba8f4e112618d786de021b3dee88012d10c019fff4b57b2da32009c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, suggests an attempt to direct users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users via deceptive links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://eldorado777.ro/upload/editor/file/27661738683.pdf In PDF document text
    • http://pileshoppen.dk/userfiles/file/dejujujepu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614105ee03d4e---46296418019.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/wopoxokawaxunesirof.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/42782257105.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/jevosolejudikiwogub.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/83605872362.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/74507821123.pdfIn PDF document text
    • https://arerp.kr/data/file///75162175010.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/vozupubajejawiwuto.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/dakapatazeginuti.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/23110764097.pdfIn PDF document text
    • https://epiphanych.com/images/file/xakixap.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/rokivikotetarudili.pdfIn PDF document text
    • http://tavio.su/files/file/3650217155.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/52120586935.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/votufuf.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/33202557795.pdfIn PDF document text
    • http://fruitvita.com/files/files/45502613364.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/9893282956.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/wuvuxumikonarini.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/tofilazutonazu.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/tatopufasunup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=photo+focus+app+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 18384 bytes
SHA-256: 55c820353f17b4e011332325b5385c82ee47813b05557f8e9e94d5e795feb148
font_01_sfnt_off00012114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001392b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392B 10640 bytes
SHA-256: e51af3315920698302cd9657f64cc34e7d8a7f4379ac73be835878316c5c6b37

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