Malicious PDF — malware analysis report

Static analysis result for SHA-256 503e11c6267103d9…

MALICIOUS

PDF

72.3 KB Created: 2021-09-19 14:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17ffeca4d8cac35de69309de2c9832b8 SHA-1: 3502bb03599da68cc352018330f082fedfab86f0 SHA-256: 503e11c6267103d937ce2da85f2fdb0c086ee55e1abff34b64b7f248c9a2e18c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that act as a link farm, redirecting users to various external sites, likely for phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic suggests a phishing pretext, possibly related to billing or subscription scams.

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.
  • 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.
  • 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://pistant.ru/uplcv?utm_term=lily+manga+apk PDF link annotation
    • https://ximangcampha.vn/upload/files/20713837251.pdfIn PDF document text
    • http://signauction.net/userfiles/file/50928605646.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/92796582222.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/suremukuri.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/42936987296.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37996164783.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/dirinofizikog.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/58851140960.pdfIn PDF document text
    • https://datawire.gr/files/files/fivapepejemil.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141e76371796---zaligomudanemojafepe.pdfIn PDF document text
    • http://altus.pl/userfiles/file/zerewijuwesijewalinetipim.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/fegamasisowozine.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/60437914728.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/71456545658.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/55411178201.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/kovumebuvobobozafijukaw.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/48025481357.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/24561032587.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/43185962068.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/sepuna.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/nekixabudup.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/49269581756.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/94980096359.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://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_off0000bc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC71 10140 bytes
SHA-256: c10c76a7395ce735d5747ba4463dd3019346182e2a3dbb1e79dc3cd056ca40d2
font_01_sfnt_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 15912 bytes
SHA-256: 78afe0dd81f13d63362c6a68f25a148d703701708d6c439cf7d7dde307bbe9cc