Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e11be042185cfe…

MALICIOUS

PDF

67.2 KB Created: 2021-09-13 21:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 283449653e6adda9ade8cf1661451293 SHA-1: 75fa37ddd869e8675fa2f7f2f6af94a87e517ea7 SHA-256: 49e11be042185cfe02aa318409f0510a7dcbb26f78ec1a4dbe178fc490bbfcf7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_IMAGE_LURE' indicates it's designed as a screenshot to hide a clickable link, a common phishing tactic. The presence of numerous external URIs, many pointing to potentially disposable domains, further supports a malicious intent, likely to redirect users to a compromised or malicious site.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://titibbs.xyz/js/ckfinder/userfiles/files/sugigodanegezidifukawo.pdf In PDF document text
    • http://nepalbestcargo.com/userfiles/file/30396443791.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109081554411466.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/67797577480.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/jofomagekadefajinadowe.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/26105658794.pdfIn PDF document text
    • http://storemisr.com/uploads/files/57178870051.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/numal.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/vukipo.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/wijupegigedamaruri.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/202196426155116.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/40802972478.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/fazewiloxivajokabulogo.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/kujopadalepoziwipikisila.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/59454365691.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/detob.pdfIn PDF document text
    • http://info56.ru/userfiles/file/89276824704.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/mudoj.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/jogevil.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/47818187492.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/zetuxodelit.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/pibosudizipuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=speaking+ringtones+androidPDF 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_off0000ab45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB45 10688 bytes
SHA-256: 33631b110bb4ef1e055bdf30c34aa8f5ca9130f8dfd293ddbf3faaefd85a8755
font_01_sfnt_off0000c3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AD 13872 bytes
SHA-256: d46f6de159566160a156e111c93b01a1275671c9a30573d6a196c4c299258ed5
font_02_sfnt_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1