Malicious PDF — malware analysis report

Static analysis result for SHA-256 1198852a9c6b73c2…

MALICIOUS

PDF

75.1 KB Created: 2021-09-12 12:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7aff05e790988c5f120781073e2dfc10 SHA-1: ccf7a67f7de903cb737ab036035237c97c2544f7 SHA-256: 1198852a9c6b73c2fc073db5b9cbee87d6410bc367c32b60683776bb57c2f097
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified numerous external URIs and a link farm pattern, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate it's designed to lure users to malicious websites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://lensmam.com/userfiles/file/xumusegedegiredido.pdf In PDF document text
    • https://ksi-system.pl/editorfiles/file/poziwipuvedufutevoneji.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/zorezotemofiref.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/44006912345.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6139c71d668d4.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/94627467241.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/78860390652.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jalidepigidigexulevoreraf.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/89155372196.pdfIn PDF document text
    • https://partetesal.ir/data/file/wevikowigununifidi.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/samovarog.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/21454883909.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/59282775246.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/kunodadixokave.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/muruf.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/vinolu.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/38822353329.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/12622902308.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/27035479656.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/75495531889.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/wivifesovolatus.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/72861964261.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/jizuxanifurag.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090823333973499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=notes+on+prokaryotic+and+eukaryotic+cellsPDF 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_off0000c1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C1 16732 bytes
SHA-256: 4a3591d6205bc55d5dfe9bf9120781c99595b70535a4e8f831da0018cd23d539
font_01_sfnt_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 10792 bytes
SHA-256: ce2c7493822b3e02e390d21585904fcd33e3ad8a682ff9f936a7fbcbf5782800