Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e8c7d7ddf46258…

MALICIOUS

PDF

85.2 KB Created: 2021-09-13 14:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 08d45844757b1535c78dcff0bfc93df9 SHA-1: 3544c790162b312841c6a4bba6e1304e76ba36b7 SHA-256: 83e8c7d7ddf462581e2d474eb9b22fd64c8449eebc2cd20f40a08a58d434027a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded links, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, suggest an attempt to redirect users to malicious sites. The presence of many distinct hosts and the use of 'utm_term' parameters in some URLs further support a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://lordoptika.hu/files/files/82246229325.pdf In PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/jesajaxixipon.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ljac3ug27u58hc8k29afchqmbl/63218462328.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/45028419783.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/nefisitokekabapikudid.pdfIn PDF document text
    • http://apcmagon.com/userfiles/61246097415.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/fizoge.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/976af06df74c9fce3f5b5e1c772af6c9/91615618008.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///fifisezop.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/58377894619.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/sapibumisotaxemuda.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/35667763921.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/vuruzew.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/gefanuximose.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210904_172605.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/44776683198.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/nofojefebuw.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/1771273893.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/2166941834.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/bewejodevipakimuk.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/lonisodagibemewa.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/gesupebuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=adult+sex+game+apkPDF 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_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 10592 bytes
SHA-256: d8f48d7cbca7bb7e26aa1f79d048891b6b43817999e2d97fc73fa7d82744beed
font_01_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 18860 bytes
SHA-256: 02a7d23daaac2e8052b8538075dd907e86d7a631b82a825945048a7c3d7e85c8
font_02_sfnt_off00012f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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