Malicious PDF — malware analysis report

Static analysis result for SHA-256 765533c166ed856c…

MALICIOUS

PDF

82.7 KB Created: 2021-03-10 14:06:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8458a8c11fd34d49c622fa735358c931 SHA-1: d656f5efe933df59545f5b0e602f062c7b708f94 SHA-256: 765533c166ed856c67a827988e53019a91bb7d0596ac6a26e94c7ff66e8e89ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying it as part of a link farm designed to boost SEO. One prominent URL, 'https://lozipotod.ru/award?keyword=advanced+oxidation+process+wastewater+treatment+pdf', is directly linked to this activity. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=advanced+oxidation+process+wastewater+treatment+pdf
    • https://cdn-cms.f-static.net/uploads/4497638/normal_5feaf69c334c5.pdf
    • https://static.s123-cdn-static.com/uploads/4480591/normal_5fe51c5241a7c.pdf
    • http://gejokakop.mygamesonline.org/53695516863.pdf
    • http://vosalax.22web.org/24708902864.pdf
    • http://kilijosizujowo.medianewsonline.com/is_sat_cancelled_tomorrow.pdf
    • http://sudoniwitexife.22web.org/foxijexaxit.pdf
    • https://static.s123-cdn-static.com/uploads/4417426/normal_6007a00db3502.pdf
    • https://cdn-cms.f-static.net/uploads/4384835/normal_60337daf1df07.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e78f73e8-06b0-414e-87c3-6ba993146f45/nesiwas.pdf
    • http://vukelas.rf.gd/fizitinas.pdf
    • http://govogudumig.epizy.com/relomikazimebitaw.pdf
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_f1329eefd131445a9ec384b117f21c46.pdf?index=true
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_f97ed40253ac4c9089ff2e95c449912f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/59dc089f-eeee-4df8-bd37-d7bbf6f9ae62/7851081210.pdf
    • http://wonanikapudidak.atwebpages.com/vekezivitetufetojiw.pdf
    • https://uploads.strikinglycdn.com/files/a61d0221-83cc-4fc0-885f-63516dd16358/how_to_install_stacking_kit.pdf
    • https://uploads.strikinglycdn.com/files/84284f0f-ae46-447c-a0d5-055e821745aa/how_to_install_a_dometic_thermostat.pdf
    • https://uploads.strikinglycdn.com/files/46208a6a-8414-450a-87be-552add6cd7ed/where_to_get_the_book_of_enoch.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f140.bin
350eb4871ea5e190425c59360950e48844bdbe0f86ac5535f5698c250c4858e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 5476 bytes
font_01_sfnt_off000103e6.bin
7059c7ef9b5c985cb7887573ba7861d9563a76f93070a7e40b403e21cd2de0c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 10392 bytes
font_02_sfnt_off000127c7.bin
dfdc6983d3c42b81f9741fa6cdceaab3e97c1fbda00e6274acf933e6ff911e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127C7 16100 bytes

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