Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f524edf82805cb…

MALICIOUS

PDF

71.6 KB Created: 2021-09-19 16:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff00293d94f98b221b7938e77193530f SHA-1: 1351ee0208d16531a68a7a881751341c97b36456 SHA-256: 47f524edf82805cb7fd236dc3391dc8c576c7d7aff49dea253bab3d704cde9ac
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with many pointing to unknown domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for distributing malicious content or redirecting users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://raffaelecavazzoni.com/userfiles/files/1255113828.pdf In PDF document text
    • https://nbtele.com/en/cache/fck_files/file/92652514777.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/94801451865.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/nerasubuwonavokuse.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/70954796588.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/30394185571.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/ed3a9813b351b5694f4ca94689ed218c/goxazexirazuxumefik.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/3362155273.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/21480537259.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/povaluvolukulinijubolaf.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614619f11b35b---62278810813.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/xiziteperelonetozub.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/tewejonoxevonituguvuvasun.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/82256249325.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/pumipup.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/709213300.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/48761858716.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/37788676536.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///wegufalasagobagokare.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/gaxodabaliwajagolog.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/8718440988.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/93532077066.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/dexenamepebenupazaf.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/57080208540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=deleting+search+history+on+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_off0000b690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB690 10764 bytes
SHA-256: c82fb9ab3165ff10863fa4f556071b220d57690b0426eea425f5ce0c57c326ec
font_01_sfnt_off0000cf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 16140 bytes
SHA-256: d9d896a1eeb679f0c08a7495621fac8c2e81c3f53a2e5c4d8f55343a4a00d3fa