Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f61e3bbaa500b0a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 06:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4871e13d0b3e0af213fa8fc116897069 SHA-1: abb6c799ea2f0bf9745399febd5a895d856d5085 SHA-256: 0f61e3bbaa500b0a3dbe0a2087832767178f2685af13b7282264330d678f3c71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable domains, suggesting an attempt to direct users to malicious websites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://classicalgardenstatues.com/uplds/file/14349450666.pdf In PDF document text
    • https://hondamienbac.vn/userfiles/file/molezodiv.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/lewimibixe.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/nuvanuzilalokip.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/34355135568.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/13856912175.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/20548323020.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348f6901f65---nibugalitew.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/rolizokono.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/83993695993.pdfIn PDF document text
    • http://pk.mo/userfiles/file/62709406446.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/dakokesutonekikesi.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/51837163766.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/85453221399.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/sivoxemupezanegevasu.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/27993494821.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/roxibime.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/74220655177.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/90069072687.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/18124550278.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/39634875380.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/nosisukaxojowiv.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/jakisipi.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/42930372273.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/57618301979.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/29605951337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+set+my+phone+ringtonePDF 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_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 10684 bytes
SHA-256: d6fde311d23b2210ecfed9e9127876d5d3f6a07df15a52a7d5a7c842cf71466a
font_01_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 17728 bytes
SHA-256: c75d08ae5325aee05a01a36d40f199db4e141ff98083ec21437abe2a95270b53