Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5ea4606d64de41…

MALICIOUS

PDF

70.0 KB Created: 2021-09-20 11:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3de1190c11027b668211d0e9c2b7174 SHA-1: a32b017ac5209bc4f7b3a0e0cf5ddcb9940f331e SHA-256: 9b5ea4606d64de4123a919fc14a7d4d9776272b5971de9fb0314d7ceb1ca3ce9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to PDF files. The primary URL, https://smidgel.ru/uplcv?utm_term=free+live+black+jesus+wallpaper, suggests a lure for potentially malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=free+live+black+jesus+wallpaper PDF link annotation
    • http://grandfiltr.com/files/file/11775648630.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/65496246614.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/83676882817.pdfIn PDF document text
    • http://soupworld.de/upload/file/xuwagotilemikixi.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/sixuxobujanidigogin.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/komakikowabobo.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/30106337959.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/28481912628.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/xuzojukidebatawat.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/22911662750.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/vidotu.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/kifenitiz.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/78309884093.pdfIn PDF document text
    • http://vhshf.de/File/xaravo.pdfIn PDF document text
    • http://didula.com/img/file/rukijiwaw.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/5615347627.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210904040751.pdfIn PDF document text
    • http://chapelguild.com/images/usr/9968372342.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/jagok.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d295e87f8---6727373673.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/92458851934.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/49230405943.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10053408497.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/bokozabidinabalegisil.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/vafojosakopikelejiwulu.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_off0000b0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F4 10636 bytes
SHA-256: 9ce7691e846bed7a77a41de60b8ff6421b98ed4d7a6b66d14b612388f7710f92
font_01_sfnt_off0000c937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE149 16116 bytes
SHA-256: 79eff60e7524fa9157ade94fb6b566b8910493e42c532accf3b12b3e5d3fb05f