Malicious PDF — malware analysis report

Static analysis result for SHA-256 925cd363989f5dc9…

MALICIOUS

PDF

76.9 KB Created: 2021-09-25 13:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 293546dfaf9d62ce36f07c597ba5525b SHA-1: d9dd72eb88e4e5d5cdb6a1993a8fbea496f011d6 SHA-256: 925cd363989f5dc980d35b3210e08113d096c8a0ab89fbd9be0f831d43b4c898
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a callback lure, prompting users to contact a number for fake issues. Although no scripts were directly extracted, the presence of external URIs and the nature of the heuristics suggest it is designed to lead users to malicious sites or engage them in social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://queure.ru/uplcv?utm_term=import+microsoft+contacts+to+android PDF link annotation
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/sawikejaxerojupuxubuf.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/78542686642.pdfIn PDF document text
    • https://atiksigorta.com/files/47999597071.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/10989784314.pdfIn PDF document text
    • http://benly-carson.com/product/files/34004940931.pdfIn PDF document text
    • http://stonebreaker.at/27001046484.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/tutifotuwekopotoso.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/67867059866.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1a2690005---maxowexowesejiletofurem.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/31716147807.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/bulumuvesovasu.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/91829384160.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b71275e36b---29641148056.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/93313066729.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/421744409421630868960.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/bilubekowotafejujut.pdfIn PDF document text
    • http://gerocuki.hu/user/file/tigob.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/21090112315154580271vikl.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/92688308320.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/5804002420.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/63597074238.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/57673339061.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB145 10552 bytes
SHA-256: 5959c51af50ad6a9bf5514e1d1654ebcc7a77de225d6df870c3e651ac424a80c
font_01_sfnt_off0000c946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC946 17076 bytes
SHA-256: 992ac1b31728ee219c2fab148b98c4b8d30aae351418eda4a1f4915a901fb1b9
font_02_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 17004 bytes
SHA-256: 71ed46919873532d8fca41bfe707e2b158ba22b5cb1c33215fecd840b5800e2b