Malicious PDF — malware analysis report

Static analysis result for SHA-256 878e5ed91810bf15…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 10:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6dedb9be7cc6bb1272c2022b706441ce SHA-1: bf5b82c78345029c6b3d924d08c4551f9794b93d SHA-256: 878e5ed91810bf150eaae47f78bb561bb384ec7fb39644e61e638457ca80e9c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM indicates it is a link farm on disposable hosting. The embedded links likely lead to malicious sites for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tsutae-f.com/js/upload/files/14797277174.pdf In PDF document text
    • https://weyergans-hcc.lv/userfiles/file/tupudavo.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/80639692699.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091706260241.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/54894992766.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/mudoji.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/11sgkoc3v3en6df2p7ltvodu67/lukixavijede.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/96444248872.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/86150049113.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/79558743913.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/75290747878.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/tesutumudabonam.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/liwoxonufanegipijexadi.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/12462654865.pdfIn PDF document text
    • https://anandalaya.in/resources/file/5590483722.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/34211882036.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/diterosam.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/kudifuxagosuromodupe.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/dipuxijuwisukalo.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-4/20210904215827540841.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/22596294834.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/69277086280.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/mupafutaranuromawiv.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/43410233319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=scag+pdf+5ePDF 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_off0000d1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 18560 bytes
SHA-256: 0100ce7f4b94ed6e94ef0c0d0960c82435afc67aa3ffd255d08aaf9dbb9ef72d
font_02_sfnt_off00011ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACE 10276 bytes
SHA-256: 20f599284d03974907693c65e6e019da4d18851ea7432dd2097c4793dbe6ebaf

Open this report in the interactive analyzer, or submit your own file for analysis.