Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1d86da3f4baa6c…

MALICIOUS

PDF

84.9 KB Created: 2021-10-14 12:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c6760663818fe1569d5fea8a99aac201 SHA-1: 3b5b745a30f1765d58e91523ba2e90bdf010a3fb SHA-256: ab1d86da3f4baa6cb2ce63a7232b062f96cc1c7e749019ad987a215abf045059
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://karpatskiles.ru/store/file/21618252252.pdf In PDF document text
    • https://dadesigning.com/daduserfiles/files/junesu.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/xiwitoxi.pdfIn PDF document text
    • http://eternaseguros.net/files/files/sepuketatuweve.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/tuwanidime.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/95725744257.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/kagonixikatufanagixud.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/bewer.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/87272528393.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/57698589344.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/45630187228.pdfIn PDF document text
    • http://tcihk.com/userfiles/posalegokimixarinev.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/varuzapubap.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9d69e61e5---xiveximupununurop.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/vanugodasinofab.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/kelonomiwiwijeniwiposoviv.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/vunegasodogizepiz.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/28257615214.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/danisezi.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/gotenoletoxuvetosaxazab.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/detezemit.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/49033603649.pdfIn PDF document text
    • https://equinox-e.com/upload/files/89980159925.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HTGXzuRVGb4/uplcv?utm_term=warhammer+island+of+blood+contentsPDF 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_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 10876 bytes
SHA-256: 43c96f01bc99f5532ab3dc23ff7d38b9cc86320cb274f0fe8982c6df892e735e
font_01_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 18860 bytes
SHA-256: d734c00803f51980dd14c6dd6be9c3c8f42485ebd67eca0b618446b909ea4490