Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ddf1332ddf77bd…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 16:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a1fdf3ac8755cf51329f0c1162411ea SHA-1: 51ce3acb7d621f6b9b9bf6481044880dff134217 SHA-256: b5ddf1332ddf77bde0c273db803fc65cb22b6c1416043c0506fe9007c9d4fc59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically flagging it as a link farm on disposable hosting. While no scripts were directly extracted, the presence of external links suggests an attempt to redirect users to potentially malicious sites or to host further malicious content, aligning with a phishing or content distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://studiogalata.it/userfiles/files/41955023559.pdf
    • https://encoyun.com/calisma2/files/uploads/26647944175.pdf
    • http://www.ap-arte.ro/fckupload/file/sononinimupemowivebusekev.pdf
    • http://drentmedischadvies.nl/uploads/files/62509607500.pdf
    • https://ateliersmq.com/pevron/www/img/file/rimirulepozum.pdf
    • http://sportservistocik.cz/UserFiles/File/podetatugododofe.pdf
    • http://smolninskayahotel.com/userfiles/file/jaxibom.pdf
    • https://ww150005.linebot.net/upfile/files/20210906131721.pdf
    • https://milsagliksen.org/upload/ckfinder/files/devezuv.pdf
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/92508920541.pdf
    • http://hhoasis.org/app/webroot/img/fck/file/14009614638.pdf
    • https://www.prshots.com/ckfinder/userfiles/files/liwivib.pdf
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/10284837888.pdf
    • http://kitpaisal.com/mypicture/file/penele.pdf
    • http://fazendasaojudastadeu.net/fotosempresa/files/90169504773.pdf
    • http://labradory.pl/file/jabejuzenelofaludilotumul.pdf
    • https://twinscooking.nl/twins/userfiles/file/nadoxileg.pdf
    • https://gulceoyunlar.com/calisma2/files/uploads/63154331893.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/5b5fb1bn9gk00e0pudpb61jfv0/36429952793.pdf
    • http://kiajihlava.cz/UserFiles/File/pakagusefato.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/korer.pdf
    • http://envisystem.com/upload/userfile/files/71528386085.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=urdu+keyboard+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b3.bin
b94e52d943558094d1cee1adc5fd28842b2efa7b2ba3846e3e8eed1a10887e62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 10328 bytes
font_01_sfnt_off0000e9e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 16792 bytes
font_02_sfnt_off000101f4.bin
6fe0c38ed873f42210a9265ddadc0c48753f0dc0fd431bd2654be08fe2916d3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 19600 bytes

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