Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9c91c51a782770…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 21:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48b31b6df66b3326d5997e32c0a5c547 SHA-1: 5943ecd04385c6bbca177ec30f897d5d66d25a33 SHA-256: df9c91c51a782770ffc1109676aceee1a6dc2188d7a8552781dbda99482e0191
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. Although no scripts were directly extracted, the PDF structure and embedded links indicate an intent to redirect users to malicious sites, likely for credential harvesting or second-stage payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=ace+player+android+apk PDF link annotation
    • https://nstyapi.com/resimler/files/68676020546.pdfIn PDF document text
    • http://chpcentre.com/files/file/52135502570.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/rokevibef.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/27811609806.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/pijade.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/rafogujefofalomiromefimed.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/rudiduruzovogajiba.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/74384020329.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9bf96a7750cac5a620d040de189cfb4e/35219687174.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/juxaxojifasopaguv.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/48383195732.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/56612409455.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/gotajavavijesobifalogof.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/woxasi.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/6462796801.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/tubapegaluvaluxevimoson.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/55028853806.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/ditolowaga.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/sedavabi.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wabivuwesolu.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/85960142349.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/37961075797.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/56013034189.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210913094846.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/76971386904.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_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 10428 bytes
SHA-256: cc72512803fe593f28b6ba04d3461a04524429a3a001985a7f08118400de33a5
font_01_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 18020 bytes
SHA-256: c6b1c11803f2542edd4e63b395a28001af32452e67b0e8382173785099d39191
font_02_sfnt_off0001256c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1