Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fe44eb961b3059…

MALICIOUS

PDF

90.8 KB Created: 2021-09-12 08:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be4672ae55222dcba27b172edfb88fa5 SHA-1: ebf1c42468b8f891a4be24e4e9562af9345e344a SHA-256: a7fe44eb961b305932fe4ed5c256a8d584d5336c4e35a59c914fcdb1389c016f
126 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. It contains numerous external URIs, many of which are embedded within the document and appear to be part of a link farm designed to redirect users. The presence of these links suggests an attempt to direct users to potentially malicious websites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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 https://huntic.ru/uplcv?utm_term=how+to+check+antutu+score+of+my+phone PDF link annotation
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161301aa85800f---xamuvuxejotajuduzibale.pdfIn PDF document text
    • http://josquin-capella.de/download/93921074050.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/8923892809.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/saterufazawewikaroluron.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/posafejavo.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/40732777180.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3628980604.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/68022472830.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/96166526123.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/22807735738.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/kiribominixe.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/befuzovekoberalob.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/kedejorunirokemovino.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/33959125118.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/24439663995.pdfIn PDF document text
    • https://limsurempat.com/contents/files/jirivibujonefagejoxema.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/59222267390.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/lobikezenexofetezaxiwe.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/3975435060.pdfIn PDF document text
    • http://manu-transport.com/documents/file/5271369497.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/98538732641.pdfIn PDF document text
    • https://tebra.si/userfiles/file/gubopes.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/kasite.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 23168 bytes
SHA-256: 3d604bad32469648824c69327b66d1ba12f71e12558ab560500ca1b19fae1df4
font_02_sfnt_off0001255d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255D 10988 bytes
SHA-256: bf7b3c99498622225bc29096d0a3cac65ce00025027b9e4d084c89f3b0e849f0
font_03_sfnt_off00013ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC1 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off000146b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B8 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f