Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e568e6d18ec00c…

MALICIOUS

PDF

70.1 KB Created: 2021-10-05 18:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 891eb2f35c966d62eca6e51e45a51c9f SHA-1: 26c291dae135bef025d93c12e9e8e371f37eadc1 SHA-256: 35e568e6d18ec00c7fefcdefeccdf453a308aa6e39128f6aded3c9e328a4bc2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=13+kw+to+hp PDF link annotation
    • http://intertermo.nl/userfiles/file/zobixonipuwuzafazipezodo.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/50566051078.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/witila.pdfIn PDF document text
    • http://specimport.by/files/files/5996607238.pdfIn PDF document text
    • https://camphacement.vn/upload/files/lejoforozosolawew.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/605e5c78df159642ef6548db7260d9d7/41578792532.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/kasijajobosufureparudi.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/98729278046.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/19876789513.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/77659973920.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/38717428974.pdfIn PDF document text
    • https://yodobashi-church.com/rovezogubezu.pdfIn PDF document text
    • http://stisk.com/file/44773190231.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/sonopule.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/72e42141e0d32aaac5dec96232c6e54f/81841894924.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/fizovibabuvewapi.pdfIn PDF document text
    • http://sedefartphotography.com/resimler/files/razulugexa.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/mojulanidasetareme.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/10759695761.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_off0000aeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC704 9852 bytes
SHA-256: 0dd1dbcbf028590c42c5e22b0e51ef109087a9cdeccb2bd304f5dd2647b14ddd
font_02_sfnt_off0000dce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 17900 bytes
SHA-256: 1297a4262cacd72427c6ca47a17269986cba8f16ee2338b296eafab036a504c5

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