Malicious PDF — malware analysis report

Static analysis result for SHA-256 f507fa1b5ac3c480…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 18:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5cfa8b4f0b300bc61a81c9acb388241a SHA-1: b7e0901b600460afebb04f81e66116fe535c0c94 SHA-256: f507fa1b5ac3c4809f709e13749a0e1e4f9635100c04195be3f1e48b4781e177
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. The presence of embedded JavaScript and numerous external URIs, many pointing to suspicious PDF files, indicates a phishing or scam attempt. The 'SE_CALLBACK_LURE' heuristic specifically suggests a callback phishing or tech-support scam pattern, where the user is prompted to call a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://conservativista.com/js/ckfinder/userfiles/files/jadefesijajokesasonaveb.pdf In PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/26681320697.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/tosezakurux.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/wowarilinamejexiva.pdfIn PDF document text
    • http://chinalabware.net/d/files/53554750435.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/bevatore.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/91414639450.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210911010756822.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/seweselu.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/62118420763.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/3584214544.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/4655075477.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/79017870788.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/35508074951.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/kb64ffv6v06d7h5pis83oe56nj/wavuvi.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/73973879331.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/22644457406.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/43208755461.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/nimizagavosi.pdfIn PDF document text
    • http://fivelscope.net/fckimages/nenogumokotexegatiba.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/88027268757.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/85623515220.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/3611944a7aca998695955dbefb21573e/dugiroropamuroseloduwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cops+n+robbers+fpsPDF 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_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 10124 bytes
SHA-256: 6af5b935eb0493dca325b35606a51efc836658898de7710c0f458cc7a8049446
font_01_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 17832 bytes
SHA-256: aeaf8283dd7bfb2819881e737353debe0135aa468d149d36a010a415bc97df63