Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bccec1e8119623…

MALICIOUS

PDF

86.1 KB Created: 2021-10-08 03:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f0832cf763798ebce1a35ffdd83dd93b SHA-1: 71b00f7dbf2697c4e6cfdb2b3e533fc52f5fb3af SHA-256: d7bccec1e8119623458b25351f3d551fd1db49872a39a28b2be3f2d111d3fe52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of multiple disposable links on potentially untrusted domains suggests an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://drafthe.ru/uplcv?utm_term=diary+of+a+wimpy+kid+book+grade+level PDF link annotation
    • https://bistakalikotenetwork.com/userfiles/file/nuzipugegomijexuvasovu.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/91481462377.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/boxanoranaluluwiri.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/95565402109.pdfIn PDF document text
    • https://chsromania.managenet.ro/images/file/21161521776.pdfIn PDF document text
    • http://citty.org/images/uploads/file/56135496486.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/jokadesowobulasewapuw.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/15304213409.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wabepuvadevilipulu.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16321496841673.pdfIn PDF document text
    • http://patroha.hu/file/64812363247.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/80537558889.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dibaguvelakikariwetogub.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/tumijotepabozaruzolarum.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/weratujirenele.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/degenejeweroku.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/90679261896.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109131925282074.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/kiruvosowitemogiwemiwejo.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/losevevofazufizazu.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/202132845614584a28bc10.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/97975104134.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/57895408140.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/natuv.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1633193524.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/pepibemazanexigibatoba.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_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 20268 bytes
SHA-256: 01e1ccb09972c03c5bf8daa97a06d4212da1e3cb97f5f0fbd3e7bf1e655f16a3
font_01_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13180 10968 bytes
SHA-256: e15402435290ba8fd07bb63de64282a0c07d7e85e0456b37433f1959c673a4de