Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e80e9e79ea1eb5c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 15:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 35f57e968d9dfeb93a4fab27f311a918 SHA-1: 2dda6846a7df8906d70296f787719099bd9f378a SHA-256: 8e80e9e79ea1eb5ca300dcf8424e3af064c40ee7069d0fd1c3f52563d38abcdc
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier strongly indicated maliciousness, and the PDF contains numerous external URIs pointing to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable hosting, likely to obscure malicious destinations or engage in SEO manipulation for malicious content. No scripts were extracted, but the structure and numerous URLs point to a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 4

  • 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://synerhu.ru/uplcv?utm_term=love+and+hip+hop+atlanta+123movies PDF link annotation
    • https://aokman-drive.com/d/files/36796832204.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/pojitibigagujajal.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/57928564076.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/xovonufafizusanewatilaboz.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/16618131430.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/69916180142.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/25409721733.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/47636eef603f37fba901f8525d2138df/zikeser.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/lovevigojafovepezadojebad.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/weluwoxebemoduzowimabaruv.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/vikoxarozitebunori.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/6965736836.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/83257103769.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/nujorid.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/85706662032.pdfIn PDF document text
    • http://vanhacollection.com/images/files/xeniguxeg.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/xaforokavukadabimav.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/zojonotuwumu.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/45808093185.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161349d1878a63---ruzipaletuda.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/lamur.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/86934696108.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/94365345308.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_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 10924 bytes
SHA-256: b87efcff33e7ba5b59f0512a388d7ea660833050a8e7d80c4acf18867beb2672
font_01_sfnt_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADC 19012 bytes
SHA-256: 57cc2aa56bdea55448151babc0986778bd5212aea1171a00340f872518630a88

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