Malicious PDF — malware analysis report

Static analysis result for SHA-256 da914aa1ab35058b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 21:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a838b11feb0eb531f6d6e0108b24034 SHA-1: 46ce3a0d01a450538ec99b914604f106ca9643ba SHA-256: da914aa1ab35058bbce0bd40f786cff5edf8dfc8849cca1200b30cea64d7dab2
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external links, many of which point to disposable domains and are part of a link farm. One high-severity heuristic specifically flagged a PDF link to an algorithmically-generated URL, indicating a likely attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://huntic.ru/uplcv?utm_term=custom+villager+trades+mcpe PDF link annotation
    • https://casaalu.com/luutru/files/94182809381.pdfIn PDF document text
    • http://consade.com/userfiles/file/majotenemak.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/wajopenurijelepude.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109141428289902.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/nazurowesunel.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/vadizamitogabowij.pdfIn PDF document text
    • http://maksimetall.ru/files/90565920622.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/furidemokigimosomov.pdfIn PDF document text
    • https://yuktogel.com/contents/files/nemozigenapebikatelaxi.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/94052592496.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/sipitetugebotodosilo.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/mulitat.pdfIn PDF document text
    • http://juha.be/_files/file/62580759019.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/wevujusarupo.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/zafinegeruwapafij.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/4738636674.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/ziboxuwuwo.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/xiwuzofuves.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/59992987195.pdfIn PDF document text
    • https://unaizahic.com/Files/files/84153104468.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rorawuwofuposajadupulax.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/zisero.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/ximujuruwigawaxavuto.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_off0000defa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 18168 bytes
SHA-256: fe84a8de5d3bc9009af89ff3a0d7c5f3809d0baba78e664178a4fc74f127316b
font_02_sfnt_off00012689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 10952 bytes
SHA-256: e6bd33b0e30659d1b077c4d14ada017b89fc93e7c1e9b189764d099eab1b852c