Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ddcdc386639fb5c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 00:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 872225f71b7134afe41339546eb0524d SHA-1: 878015a781025efe06d312800815917820ace1ec SHA-256: 3ddcdc386639fb5ce7143da569f3e7f35d2cdd665a2868e19c2eb37338e4b4fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains numerous links to disposable hosting, suggesting a tactic to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the PDF structure and link farm behavior strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137482ea4cdd---33409742123.pdf In PDF document text
    • http://isystem.hu/userfiles/file/gidedojowufo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613baea626292---risewagexanufuzavituxisu.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/21137260636.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/5919359657.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/49199937810.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/sozepekuwewosipa.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/bumibevaxakalakafekub.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/74901078986.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/laluxudularotefawogi.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/zotofabegirowazi.pdfIn PDF document text
    • http://fullx.net/files/13917969198.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/tuvigilirowub.pdfIn PDF document text
    • http://mamam.by/upload/File/file/82639921154.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/duwaxufevugujoxaj.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/66830131138.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/4006487309.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/37597303076.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/pavetavojugatonu.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/72162479895.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/49549717198.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/4338364456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=resnick+halliday+walker+physics+book+pdfPDF 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_off0000d532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD532 18320 bytes
SHA-256: aa6af14ebc5fb71aad4d20b5a4e26bbf6df36f918a1e2107a7b83d1e6e5b1b6c
font_01_sfnt_off000104cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 11096 bytes
SHA-256: 6036ea6c0099e9c43e51fa470d26646ecf67d807294d3bb92751487085455469
font_02_sfnt_off00011e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1