Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f1c45eca0d407e…

MALICIOUS

PDF

85.6 KB Created: 2021-09-15 23:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b709ee899124dd7df9f4d3bffc4b563 SHA-1: b7b47b8935ee4358f9c3c28f2d60d96ad5a4571b SHA-256: 38f1c45eca0d407e48cf589fdd670662e4be70836ec58f6a7fbc940737c343c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosts, and is identified as a link farm. The PDF structure and embedded content suggest it's part of a phishing or SEO manipulation scheme, likely intended to redirect users to malicious content or further download stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142320371b40---47316480931.pdf In PDF document text
    • https://seger.cz/userfiles/file/vitanusasamaxivaxa.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/misowokibo.pdfIn PDF document text
    • https://fasleh.net/Files/files/90099415003.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/80222603013.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/24831296354.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/9994995411.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb6e4a544f---38084215738.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/xegakifu.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/71126178770.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/megalu.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/77500205915.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/32942085513.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/gagutediz.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/fodonor.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/zaxunapakikizotuf.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/juperuromexezigolos.pdfIn PDF document text
    • https://paperland.bg/uploads/file/9216947638.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/98101599198.pdfIn PDF document text
    • http://furniture83.com/upload/files/52735513949.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210913_C67655E133B5BED9.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/zorenukajeji.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/10961665385.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021916245281019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=app+systemizer+android+11PDF 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_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 17180 bytes
SHA-256: bda1be34d9e0e1dd63cf3cefc793f6cf5b46916f7e556d38049b690067ee33bf
font_01_sfnt_off000117ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EE 10712 bytes
SHA-256: f83168690c62188f2204d3af55a492d3ea0db6b0990be505d174d05f2b3a4912
font_02_sfnt_off000130a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1