Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8f492acded5c12…

MALICIOUS

PDF

68.0 KB Created: 2021-09-28 21:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 106291b638ae516d5e4d0265921db9eb SHA-1: ef8c9b649661e46af4b2c4cfcc2cbe6af554774b SHA-256: fa8f492acded5c123fa0195769a62f4c9a7b0248e91c5071266950195d5f21be
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or link-farming scheme. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://catamma.ru/uplcv?utm_term=call+of+cthulhu+scenarios+pdf PDF link annotation
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304128e729e---midowoxujovosodobaxolepo.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/92357969671.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/58204995300.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202196141632.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/97650279056.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/bawevupiginasipu.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/rijugagoxirawubogato.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/9776111382.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/86073230346.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/wezuve.pdfIn PDF document text
    • http://elitk.ru/_files/65777552048.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/pukifetikopimava.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/duwupevigofowonoxul.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/mububumobokupegozemito.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/juwafodosenawubunabut.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/xixidolinoxex.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1614dfd0f67598---towerikewoxewagu.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_off0000a7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7F3 10848 bytes
SHA-256: c3fad48474b1e121e5e4ff097593784b51d5389723be793481e4c72e07cf8415
font_01_sfnt_off0000c0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 16644 bytes
SHA-256: 3d8977bb6dd6bf1d333c7dd24cdb5a20f49e04ad6e07d9ba9dff05fde42c0eaf

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