Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b8eab387522f4c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 03:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53fa8ec163045ca0cedfc9394c90ad6f SHA-1: d488cd18d90a3a75bcbfc64e44bc8f484911e04e SHA-256: 80b8eab387522f4c98b28c1281f2ffe859b2576cb9e674ffa0156da94fed8ec0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs pointing to external domains, many of which are flagged as link farms on disposable hosting. The primary purpose appears to be directing users to these external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=happy+birthday+drinking+gif+funny PDF link annotation
    • http://elisa5888.com/shopadmin/upload/files/53810665848.pdfIn PDF document text
    • http://afslab.asia/upload/files/luvimejatugi.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/dukujobemejaxebutokelo.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/3854593462.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/jafasivuxuvasid.pdfIn PDF document text
    • http://risme.vn/files/perol.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/debuzoxopo.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/26425467532.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021914130209727.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/38190765705.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/rudejorivovukukuregetasib.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/bitudimuda.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/48535019562.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631310337.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/xigixa.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/ratodakozaromedeni.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/zonatidotame.pdfIn PDF document text
    • http://195exim.com/datas/files/midiwa.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/bowowuzoka.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/movabenomipamidu.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/zadebofer.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/sezafodekikaku.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/34413185998.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_off0000d2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B2 10748 bytes
SHA-256: ddd5ab6477539ce70dcb7a6b08809022e0523c0f53f85c036a92d31bd10e4ec5
font_01_sfnt_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 18064 bytes
SHA-256: 720f4fb08a24e01b3902c8a994b8224f24025088a495bd83733228631eaeb20f
font_02_sfnt_off0001193a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1